@dirkkramm I've had a similar problem;
Opera updated to this new version automatically yesterday, which worked fine, but on shutting down the PC and re-booting for the second time (first this morning was OK) this new version lost all my saved tabs and previous session; just over 300 tabs split over 6 different workspaces.
Annoyingly, it also deleted all my history from all workspaces tabs etc.
Settings do still show to restore previous session on bootup.
The old trick of Control-Shift-T wouldn't restore anything, presumably as all the history had been deleted.
Fortunately, my speed dial shortcuts still worked, as I have several folder containing backups of the workspace tabs from a couple of weeks ago, so only lost current tabs completely.
Normally do a full backup of everything before updating, but this one happened in the background without asking.

Seriously unimpressed with the colour scheme for the new Speed Dial window "birds"
The picture/logo in each icon is tiny on white icon, with white writing on a pale and fading turquoise background.
The screen is almost illegible on my fully calibrated monitor.
There doesn't seem to be any way to change the base colour scheme in that window of either the background or font.
Also, panel of icons seems fixed at 6 columns, even on a wide screen in landscape format
Cheers
Bill
p.s. tried to upload a screenshot here, but that doesn't seem to work.
Exclamation mark & 1st bracket removed to show the error; that file is actually the screenshot
Capture.JPG]([[error:parse-error]])

Opera updated to this new version automatically yesterday, which worked fine, but on shutting down the PC and re-booting for the second time (first this morning was OK) this new version lost all my saved tabs and previous session; just over 300 tabs split over 6 different workspaces.
Annoyingly, it also deleted all my history from all workspaces tabs etc.
Settings do still show to restore previous session on bootup.
The old trick of Control-Shift-T wouldn't restore anything, presumably as all the history had been deleted.
Fortunately, my speed dial shortcuts still worked, as I have several folders containing backups of the workspace tabs from a couple of weeks ago, so only lost most recent tabs completely.
Normally do a full backup of everything before updating, but this one happened in the background without asking.

Well it's done it again.
Closed down normally this morning with about 250 tabs open split over 5 workspaces.
Restart this evening, all gone, and no history showing.
Restarted tabs from saved speed dial folders, went OK until restoring the final workspace, whereupon it crashed and locked up again, showing about 13GB memory in use via W10 task manager, with 0%CPU allocation. Now it's booted up and running, it shows 2.4GB in use.
Restarted PC a couple of times, and Opera eventually booted OK with the restored tabs from the older session stored in speed dial folder(s)
It looks like one needs to back up all working tabs before shutting down every time now.
(Save all tabs as a speed dial folder; N.B. you need to do this for each workspace.)

This post is "for your Information", rather than seeking help;

For the third time now I've experienced, out of the blue, "Opera not responding" a couple of seconds after opening.
Checking resources via Task Manager, shows High CPU & Memory usage and Very High Power.

This last time, I downloaded the latest version and upgraded, to no effect.

Correlation with my vague memories of the past, I think in each case, the cause has been the same.
Win10 64 bit has updated in the background, silently and without my knowledge, and has been sitting awaiting a re-start.
Even at this point, before the restart, Opera freezes, just giving the options to wait or close, (if indeed this popup appears at all; sometimes I need to use Task Manager to End Task). After the re-start, there is no improvement; and changing various Opera, or Windows, settings makes no difference.

I've now found that just allowing Opera to Wait, it eventually kicks back into life. The PC can be used with a different browser whilst you're waiting, and functions normally with other programs; albeit a little slower.

N.B. don't be impatient, I've had to leave the PC turned on, with Opera consuming lots of resources, for upwards of 3 hours, and once overnight. It does however eventually sort itself out.

Bill

@dougmail
I'm not telling you to do anything.

Mine's 16GB I7 @ 3.6GHz
For someone having the problem of Opera freezing during and after a W10 upgrade, it provides a solution, albeit a slow one.
Have you any better ideas for next time I have the problem??
Bill.

@AnthG don't know if you're still monitoring this thread.
When I had this problem, I just let Opera " wait for program to respond" rather than "end program"
Be patient, it can take several hours, or even overnight.

Same again as previous; It seems to happen at least once a week.
Opera crashed when scrolling through a page.
Reboot program, but lost 250 tabs split over 6 workspaces.
All Opera browsing history deleted too, even though it's set to save history and retain previous session.
Whilst restoring workspaces from speeddial folders, crashed again, but this time taking both monitor displays with it.
Eventually had to re-boot machine with re-set button, but on Opera re-booting and restoring via Speed dial folders, crashed again three times.

Well it's done it again.
Closed down normally this morning with about 250 tabs open split over 5 workspaces.
Restart this evening, all gone, and no history showing.
Restarted tabs from saved speed dial folders, went OK until restoring the final workspace, whereupon it crashed and locked up again, showing about 13GB memory in use via W10 task manager, with 0%CPU allocation. Now it's booted up and running, it shows 2.4GB in use.
Restarted PC a couple of times, and Opera eventually booted OK with the restored tabs from the older session stored in speed dial folder(s)
It looks like one needs to back up all working tabs before shutting down every time now.
(Save all tabs as a speed dial folder; N.B. you need to do this for each workspace.)

Seriously unimpressed with the colour scheme for the new Speed Dial window "birds"
The picture/logo in each icon is tiny on white icon, with white writing on a pale and fading turquoise background.
The screen is almost illegible on my fully calibrated monitor.
There doesn't seem to be any way to change the base colour scheme in that window of either the background or font.
Also, panel of icons seems fixed at 6 columns, even on a wide screen in landscape format
Cheers
Bill
p.s. tried to upload a screenshot here, but that doesn't seem to work.
Exclamation mark & 1st bracket removed to show the error; that file is actually the screenshot
Capture.JPG]([[error:parse-error]])

@leocg
Yes completely normally, and only one window open, not a spare blank window hidden behind the main one and inadvertently closed last in error; I've been there before.
I wasn't too perturbed as Control-Shift-T has restored my previous session, with all tabs and workspaces, successfully in the past, but not this time; even past history was completely deleted, including from this morning.
Cheers Bill

@namero999
When you restore all the tabs possible in each given workspace, right click the tabs bar and "save all tabs as a speed dial folder"
Repeat for each workspace.
I lost all tabs in each workspace, but had a backup like that for each workspace, albeit a couple of weeks old.
If you need to restore, open the now blank workspace, right click on the speed dial folder, and open all tabs; again repeat for each workspace.

Does anyone know how to backup these folders' content from the Speed Dial?
Sussed it, Opera "O" top left hand corner - Left Click - Bookmarks - Export Bookmarks
One of the bookmarks folders exported is Speed Dial.

Opera updated to this new version automatically yesterday, which worked fine, but on shutting down the PC and re-booting for the second time (first this morning was OK) this new version lost all my saved tabs and previous session; just over 300 tabs split over 6 different workspaces.
Annoyingly, it also deleted all my history from all workspaces tabs etc.
Settings do still show to restore previous session on bootup.
The old trick of Control-Shift-T wouldn't restore anything, presumably as all the history had been deleted.
Fortunately, my speed dial shortcuts still worked, as I have several folders containing backups of the workspace tabs from a couple of weeks ago, so only lost most recent tabs completely.
Normally do a full backup of everything before updating, but this one happened in the background without asking.

@dirkkramm I've had a similar problem;
Opera updated to this new version automatically yesterday, which worked fine, but on shutting down the PC and re-booting for the second time (first this morning was OK) this new version lost all my saved tabs and previous session; just over 300 tabs split over 6 different workspaces.
Annoyingly, it also deleted all my history from all workspaces tabs etc.
Settings do still show to restore previous session on bootup.
The old trick of Control-Shift-T wouldn't restore anything, presumably as all the history had been deleted.
Fortunately, my speed dial shortcuts still worked, as I have several folder containing backups of the workspace tabs from a couple of weeks ago, so only lost current tabs completely.
Normally do a full backup of everything before updating, but this one happened in the background without asking.

@windbags

@windbags said in Opera 67.0.3575.31 totally unusable on Windows 10 x64:

@peak4 said in Opera 67.0.3575.31 totally unusable on Windows 10 x64:

@jimmybfmv said in Opera 67.0.3575.31 totally unusable on Windows 10 x64:

@windbags Have you tried peak4's "solution"?

@peak4 said in Opera 67.0.3575.31 totally unusable on Windows 10 x64:

When I had this problem, I just let Opera " wait for program to respond" rather than "end program"
Be patient, it can take several hours, or even overnight.

I had sync disabled since the update but I just tried signing in again and it worked for me, too! "Several hours" seems a bit extreme but I did have to wait 5 minutes on a sluggish laptop and 1–2 minutes on a less sluggish desktop PC for Opera to respond again. After that I was logged in and everything had been synced.

It may well depend on how many tabs you have open at the time it hung.
For various reasons, and it never normally causes issues, I was probably running with 100+ open at the same time,

I had a few tabs, as I always have several "tasks in progress" that need the info, but nothing like that many. I did try removing ones I thought I could easily retrieve, but after three goes I was getting fed up of it "not responding".
Waiting for minutes/hours/overnight on the "hope" of eventually getting a response is not the mark of a useful browser - especially when Windows 10 updates keeps forcing me to restart the system.

I've had the problem three times now, and in each case, it's when Windows has decided to do a major update in the background without telling me.
It's almost as though Opera is using a file in Windows, which the update changes on the fly, and then Opera gets its knickers in a twist.
Maybe because I normally have so many tabs open, otherwise without issue, the file update causes something to re-sync which then fails.
even when I save all open tabs to a speed dial folder, it doesn't take long, maybe a couple of minutes at most.
It's also noticeable that when Windows is updating itself, Opera Crash Reporter (or whatever it's called) itself crashes.
Bill

@jimmybfmv said in Opera 67.0.3575.31 totally unusable on Windows 10 x64:

@windbags Have you tried peak4's "solution"?

@peak4 said in Opera 67.0.3575.31 totally unusable on Windows 10 x64:

When I had this problem, I just let Opera " wait for program to respond" rather than "end program"
Be patient, it can take several hours, or even overnight.

I had sync disabled since the update but I just tried signing in again and it worked for me, too! "Several hours" seems a bit extreme but I did have to wait 5 minutes on a sluggish laptop and 1–2 minutes on a less sluggish desktop PC for Opera to respond again. After that I was logged in and everything had been synced.

It may well depend on how many tabs you have open at the time it hung.
For various reasons, and it never normally causes issues, I was probably running with 100+ open at the same time, maybe a lot more.
I've not tried it yet, but the latest version of opera has something called Workspaces available as a plugin or something, which might let me organise things differently.
Bill

@AnthG don't know if you're still monitoring this thread.
When I had this problem, I just let Opera " wait for program to respond" rather than "end program"
Be patient, it can take several hours, or even overnight.