@synexxct How about resetting flags and settings?

@ravenrei https://forums.opera.com/post/298643 should be some general things you can try.

Opera is capable of playing h.264 video in an mkv container for example. But, Opera doesn't have a video/x-matroska mime-type/file-type handler to embed the file with the HTML VIDEO element when you navigate directly to the file. Therefore, the file is downloaded instead. Same in other browsers.

Note this issue just started in last 2 days....

Think we need a link to an mkv file that worked a few days ago for you but doesn't now.

@arturot It's not that they are available in the main Opera page, you need to know where to find them. So, you probably know what is needed to run those old versions.

You know, software companies don't exactly like people that use old versions, so why they make things easier for those people?

If someone wants to use an old version of any software, s/he should do it by itself and on her/his own risk, without expecting any support from the software makers.

@steriyud Click on the other speed dials icon in start page, select the device, click on the three dots on the top right, choose import all.

@yasirm When you say "can't move the cursor", you mean using the keyboard, or clicking elsewhere, or what?

Kill Opera in the task manager, restart your computer, uninstall Opera (don't choose to delete your data for now), and reinstall.

If that doesn't do the trick, test in a standalone installation. If Opera works fine there, you know it's something with your profile. If Opera doesn't work fine there either, goto the URL opera://settings/system and disable hardware acceleration. When you kill Opera and start it back up, goto the URL again and make sure hardware acceleration is still off. If not, kill Opera and modify its shortcut to pass --disable-gpu to launcher.exe. If that doesn't work, I'd look for issues outside of Opera.

Now, if you find out it's your Opera profile that's causing the issue, I would goto the URL opera://about, take note of the "profile" path, kill Opera, and delete the 3 history files in Opera's profile directory. You'll lose your history of course, but that might fix it as those files recently got corrupted for some users.