@Nebster66 I'm going to say "yes" that I believe this is caused by a change in the Opera browser platform because I have the same setup on multiple devices - the above report was my observation of behaviour on a desktop computer but I have repeated the same test on a laptop and seen the same results.

For the behaviour match on both, something has changed in either the browser or the underlying OS - both run Windows 10 Pro and both have PowerToys with all updates being applied in a timely manner.

So either Opera's browser has changed or Windows/PowerToys has changed to result in the observed change.

Can't be definitive here on which one is the culprit but thought with my initial report above to simply corroborate your observation with my own experience.

Aside about Chrome PiP:
When I right click on a video in Chrome, I only get a handful of copy options, a troubleshoot option and the stats for nerds option. I'd always assumed Chrome left it to the extensions platform to provide PiP functions where Opera and other provide these extra QoL features as part of their USP. (Excuse the acronym soup!)

I checked again and my copy of Chrome did not have built-in PiP on Win 10 Pro.

But the Chrome web store has the following PiP extension provided by Google so I added that to my Chrome install, tested it on a YT video and the pop-out video window could be snapped to my FancyZones grid.

https://chromewebstore.google.com/detail/picture-in-picture-extens/hkgfoiooedgoejojocmhlaklaeopbecg

I then installed that same plugin into my Opera GX browser and the pop-out video window could NOT be snapped to my FancyZones grid.

Thus, the underlying way that the Opera browsers are facilitating the popout-video windows, either natively or via other party's extensions, is now incompatible with FancyZones.

Just a bit of additional info for anyone looking on from a technical perspective.

@Nebster66 I'm going to say "yes" that I believe this is caused by a change in the Opera browser platform because I have the same setup on multiple devices - the above report was my observation of behaviour on a desktop computer but I have repeated the same test on a laptop and seen the same results.

For the behaviour match on both, something has changed in either the browser or the underlying OS - both run Windows 10 Pro and both have PowerToys with all updates being applied in a timely manner.

So either Opera's browser has changed or Windows/PowerToys has changed to result in the observed change.

Can't be definitive here on which one is the culprit but thought with my initial report above to simply corroborate your observation with my own experience.

Aside about Chrome PiP:
When I right click on a video in Chrome, I only get a handful of copy options, a troubleshoot option and the stats for nerds option. I'd always assumed Chrome left it to the extensions platform to provide PiP functions where Opera and other provide these extra QoL features as part of their USP. (Excuse the acronym soup!)

@Nebster66 Same here.

I'm on the following version of Opera GX (see bottom of post) and it's very recently stopped allowing me to snap the pop-out video to my FancyZones grid.

From my quick browser survey below, seems it's more an Opera issue than a Chromium issue and not limited to just the GX product line.

Win 10 Desktop Browsers:

Opera GX (Chromium) - Broken
Opera One (Chromium) - Broken
Arc (Chromium) - N/A (No popout feature on Win)
Brave (Chromium) - N/A (No popout feature on Win)
Chrome (Chrome) - N/A (No popout feature on Win)

Edge (Chromium) - WORKING!
Firefox (Gecko) - WORKING!
Vivaldi (Chromium) - WORKING!

Opera versions: 2024-10-07
LVL6 (core: 114.0.5282.84)
Opera is up to date
Update stream:Early Access
System:Windows 10 64-bit
Chromium version:128.0.6613.162

Opera One(version: 114.0.5282.86)
Opera is up to date
Update stream:Stable
System:Windows 10 64-bit
Chromium version:128.0.6613.170

@l33t4opera I suspect the cause of the problem must lie within my profile. I didn't have time to investigate this before the new version (84.0.4267.0) was released though I had some suspicions because the previous version that I first reported the problem with was fine on a different device.

When I ran the update to 84.0.4267.0 I experienced the same repeat-crashing behaviour.

I then closed Opera Developer, removed the two "Opera Developer" folders below and restarted Opera. Though of course it comes up completely un-customised, it came up and stayed up. So, problem must be in the profile.

C:\Users{username}\AppData\Local\Opera Software\Opera Developer
C:\Users{username}\AppData\Roaming\Opera Software\Opera Developer

[Just for an aside...]
Luckily for me, I have all versions of Opera installed on my machine alongside each other along with most major browsers. They all have their niche roles to play though Opera Developer has been my daily-driver for the bulk of my browsing. I switched to Opera GX over the past week ... not too painful since I had all the same plugins in each Opera installed already. Bookmarks sync between Opera browsers via Opera Sync. Passwords via a password manager. The main thing I lost was that I had not exported the cookie/javascript permission rules in the addon I use so each site I visited this past week was back to zero Javascript running until I advised which scripts were allowed and which were blocked.

I can probably automate a sync on that in the future between browsers. I'm hoping the addon uses the same format across all platforms because I use the same addon in all Chrome browsers and Firefox, .,.. it's been in the back of my mind for while to look into doing that anyway. Will have to look into where the addon saves that data to. Might have to wait until the New Year though... things are getting busy for some reason just now!

Thanks for following up with me. Will transition most of my preferences back to 'Developer' in due course. Back to normal soon!

This update crashes for me instantly as the browser loads.

Browser updated to 84.0.4260.0 this morning.

Browser restarts then crashes again, several times, disabling addons, still crashing, before finally exiting.

Have run a re-install using the offline-download package from the Opera Developer download site. Same crashing result occurs.

Am therefore unable to use Opera Developer at the moment. Will wait to see if it's a wider problem and an update is forthcoming as a result.