I have exactly the same problem. PC is Win 7 and Opera has been updated to v86.0.4363.23, but that made no difference. I then tried Recover Opera Settings Only and that reset the the saved tabs to that session. But the next day it did not update and is now frozen on the tabs of a week ago.
I tried the suggested fix disabling Opera Flags and re-starting, but that made no difference.
I have sent a bug report to Opera, but they say they do not acknowledge individual problems, so not sure where to go from here, as it is Very annoying.
Best posts made by LSWRArt101
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RE: Opera not saving/restoring session properlyOpera for Windows
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Photo will not upload to Gmail (only problem on Opera)Opera for Windows
I tried to attach a photo to a gmail and it won't upload and I get an error message. There was an upload error. Dismiss. I tried re-starting Opera and clearing history, but the problem persists. I then went on Chrome and sent the same photo by Gmail and it worked no problem, so it appears to be an Opera problem, not Gmail.
Help?