@leocg I went into the install ("C:\Users\AppData\Roaming\Opera Software\Default...") directory and copied all the personal files. Then I erased the entire folder and everything in my system that was related to Opera, hoping a complete fresh install would solve the problem and give me an Opera that can use the personal files from before. I was able to restore all bookmarks and history installing GX, but the passwords did not reappear. Regular Opera still has the same problem of just not wanting to be.
