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I had a similar problem 17 days ago, and when I managed to log into my account, Opera GX crashed and, after a few more attempts and reinstallations of Opera GX, I lost a part of the bookmarks because they were not recovered in the synchronization of data, bookmarks and etc. I talked about it, in this topic: https://forums.opera.com/topic/58229/after-crashing-and-i-reinstalled-without-keeping-my-data-i-can-t-recover-some-bookmarks-folders-anymore
I don't know what happened, but I had a problem with Opera GX and it took about 30 minutes to display something in a tab, and when it did, it appeared that it was out of memory to display the page (this even with the page incognito tab initial). This happened after I went to Windows 10 version 19044.2130 (I don't know if there is a correlation). I reinstalled Opera GX, the first and second time without erasing my data, but I still had the same problem. I reinstalled erasing my data, and restored my full backup. Crashed again. I reinstalled one more time, clearing the data, but only asking to recover my Bookmarks backup. It didn't crash again, but it didn't recover my Bookmarks completely (failed to recover 3 Bookmark folders). I reinstalled about 3 more times, cleaning my data and recovering the Bookmarks backup, history open tabs. It didn't crash, but I can't recover these 3 Bookmarks folders anymore. I don't know what I can do. I would like to report this issue and see if anyone has a solution for this issue.
Thanks