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Just so everybody knows -- Opera is aware of the issue:
https://blogs.opera.com/desktop/2023/08/introducing-opera-102/
This is how I fixed it:
That seemed to bring back all my settings, bookmarks, etc.
How is it disabled?:
** If I go to Opera.com and try to download the Windows version is gives me the 102 Setup
** If I go to https://get.geo.opera.com/pub/opera/desktop/ it still lists 102 as available
In my case I always go to the offline installer directory (firewall doesn't allow me to do online install), and today I saw 102 there. So naturally I downloaded and installed it, and BAM -- all of my info gone!!
Luckily I was able to fix it this way:
Very bad of Opera to put 102 out there as Stable with this major issue. Then to post on these boards that it has been removed when it's still there for download ....
@remmachine
In that directory, delete the "opera_gx_splash.exe" file (when you have Opera shut down of course).
That will stop it, but you will need to do it again it Opera updates to a newer version.
It shows up for me on W10. Go to the Control Panel, then Programs and Features, scroll down to Opera, and right-click then Uninstall. Once it started it gave me the checkbox for Delete all Data (it paused there and I had to answer before it continued). Make sure the box is unchecked then click the Uninstall button.
@135mech, @wandi, (and all others):
As I posted above it seemed to work for me. And on the Opera blog they claim that they have disabled auto-update for the time being since so many people are having the problem. So once you go back to 101 it should NOT auto-update (at least according to the Opera folks ....)
@leocg:
I am not talking about auto-update (that does not work for me anyway since I am behind a firewall).
I am talking about 102 still being downloaded through the offline directory or even right from the link on the Opera homepage. If people don't know to read these forums first you end up thinking 102 is "stable" and installing it anyway!
Well I just noticed newer version 102.0.4880.29 on the ftp and offliner installer sites (timestamped 29-Aug-2023 13:41).
Who wants to be a guinea pig??? 
WooHoo - it seems to work!
I installed 102.0.4880.29 over top of 101.0.4853.58 without any problems. It moved all my data and everything works. You still get the silly "O" splash screen and noise, but you can disable that by deleting the "opera_gx_splash.exe" file (but you need to do this every time Opera updates).
Disclaimer -- As I have posted before, I am behind a firewall and use the offline installer. This is what worked for me. I have not tried Opera autoupdate so I don't know if that works or not.
@dbaillieuk01
Have you seen my recent post? There is now a newer 102 version (102.0.4880.29) which seems to work correctly. I know you can get the offline installer directly from here:
https://get.geo.opera.com/pub/opera/desktop/
I don't know about the Opera homepage or autoupdate though ...
Well Opera, I give up ....
I have been an Opera user since a few days after it was released to the U.S. I have sung your praises on numerous occasions and even stuck with you through the move to Chromium (not a good move IMHO). But these latest problems with profile migration are killing me!
I went through all the pains these last few releases, but finally had 102.0.4880.29 working correctly. Then when I updated from .29 to .33 nothing migrated, so I followed the instructions about copying Default data over. That worked good for a few days, and now I saw .40 released. As soon as I upgraded - Bam! - no profile migration. So I went back to the blog post instructions for moving profile data, but this time it didn't work correctly. So no choice but to roll back to Version 101.
So now I have officially rolled back to 101.04843.58 and have all my data. I have synched my Opera account to make sure it all goes to the cloud, but as you know that doesn't capture everything. I have also deleted "opera_gx_splash.exe" to get rid of that annoying startup screen. It looks like I am stuck using 101 for a long time.
Even this one still has issues: "O" Menu button is not rendered correctly, Minimize/Maximize buttons do not work in Win10, you can't drag and drop bookmarks into folders, and a few other things. I have been living with these since they were just inconveniences, but how can you upgrade from 102.xxx.29 to .33 to .40 (all within version 102) and still not have profile migration working correctly. Once you have moved profile data shouldn't all subsequent 102 versions read from the same folders?!?!
Thanks for the suggestion but it was already turned off.
Just for fun I clicked it on, restarted Opera, clicked it off again, another restart. Still didn't change anything.
Thanks for the helpful replies. That's more than Opera has done to this point!
It's possible that my OS is not up-to-date, but Windows Updates are controlled by our I.T. department. I am still on Windows10 if that makes any difference.
I am still confused why 109 would work fine, then everything above that does not. Since nothing changed on my end that means that something had to change in the Opera code, or possibly the Chromium base, that is causing this to happen (BTW - I am also running the latest version of Chrome for comparison and it doesn't exhibit this behavior). That is what I am asking Opera to investigate.
I love this browser and have been a user since it's release in 1995 but the recurring problems since the move to Opera One are pushing me toward others. I am trying to stick with it though since it's still the fastest browser out there!
@bali505
It may have something to do with our firewall, but absolutely nothing changed on our end. Everything worked fine under 109.x, then when I installed 110.x it showed the behavior.
If you read my post I was running 109, updated to 110 and restarted (took about 5 minutes) and the behavior was there, then rolled back to 109 and restarted (another 5 minutes) and it was back to normal. Over the next few weeks I tried various 110.x, 111.x, and now this morning 112.x releases. Every single one of them exhibits the same behavior, but as soon as I go back to 109.x everything is fine. Since nothing changed in our firewall that tells me it's related to the Opera releases.
Well here goes my "normal" post for the last releases .....
And still no fix for the problem I have been having since the first 110.x version .....
Here is my previous post (which also includes the original post right after the first 110 release):
Opera:
Why have you not fixed the dns handshake issue i asked about many releases ago????
It has been present since the first 110 Stable release. Here is my original post:
Has anybody experienced trouble with pages loading on 110?
Yesterday I updated from 109.0.5097.80 to 110.0.5130.23. Although I am behind a corporate firewall, many sites that I went to minutes before the update would not work correctly after the update. Many gave me handshake failures and 404 errors related to CloudShare. Other sites loaded with strange formatting, and some would load but without images.
Like I said, the only thing that changed in those 10 minutes was updating Opera version. I rolled back to 109.0.5097.80 and everything is fine.
We are now 13 so-called "stable" releases since that post and still no fix!!
And here is my latest post in the 111.x thread .....
@leocg
Here is one example (just one, there are many more like this):
https://detroitwheelandtire.com
Fine in all 109.x versions, but doesn't work in 110.x, 111.x (and now 112.x since it was released this morning). Of course I can reload or click through to get to the page, but before 110.x it automatically loaded and I never got this error.
Ironically, here is another one that doesn't work:
https://forums.opera.com
(I had to roll back to latest 109 version to get logged in to make these posts!)
As soon as I roll back to 109.0.5097.80 then everything loads up correctly and immediately!
@leocg
Here is one example:
https://detroitwheelandtire.com
Fine in all 109.x versions, but doesn't work in 110.x, 111.x (and now 112.x since it was released this morning). Of course I can reload or click through to get to the page, but before 110.x it automatically loaded and I never got this error.
Ironically, here is another one that doesn't work:
https://forums.opera.com
(I had to roll back to latest 109 version to get logged in to make these posts!)
As soon as I roll back to 109.0.5097.80 then everything loads up correctly and immediately!
@leocg
Tons of examples, but I have rolled back to 109.0.5097.80 (that version doesn't exhibit the behavior).
I'll have to see if I can install the latest 111.x, get screenshots, then roll back again ....
And still no fix for the problem I have been having since the first 110.x version .....
Here is my previous post (which also includes the original post right after the first 110 release):
Opera:
Why have you not fixed the dns handshake issue i asked about many releases ago????
It has been present since the first 110 Stable release. Here is my original post:
Has anybody experienced trouble with pages loading on 110?
Yesterday I updated from 109.0.5097.80 to 110.0.5130.23. Although I am behind a corporate firewall, many sites that I went to minutes before the update would not work correctly after the update. Many gave me handshake failures and 404 errors related to CloudShare. Other sites loaded with strange formatting, and some would load but without images.
Like I said, the only thing that changed in those 10 minutes was updating Opera version. I rolled back to 109.0.5097.80 and everything is fine.
We are now 11 so-called "stable" releases since that post and still no fix!!
Google Chrome does not exhibit this behavior. I have not tried any other Chromium-based browsers since they are not supported by my company.
I know the updates take time, but we are now 8 supposedly "stable" releases since the behavior started ...
Opera:
Why have you not fixed the dns handshake issue i asked about many releases ago????
It has been present since the first 110 Stable release. Here is my original post:
Has anybody experienced trouble with pages loading on 110?
Yesterday I updated from 109.0.5097.80 to 110.0.5130.23. Although I am behind a corporate firewall, many sites that I went to minutes before the update would not work correctly after the update. Many gave me handshake failures and 404 errors related to CloudShare. Other sites loaded with strange formatting, and some would load but without images.
Like I said, the only thing that changed in those 10 minutes was updating Opera version. I rolled back to 109.0.5097.80 and everything is fine.*
We are now 8 stable releases since that post and still no fix!!
Thanks for the suggestion but it was already turned off.
Just for fun I clicked it on, restarted Opera, clicked it off again, another restart. Still didn't change anything.
Well yet another 2 releases and still the same issue. And nobody from Opera has replied to my post or reached out to investigate. So much for customer support.
I am a long-time Opera user so I will try to keep using it, guess I'll just have to stay on V109 for a while ....