pkaster - 12:22 pm on Nov 24, 2010 (gmt 0)
I keep a copy of Opera around for testing, of course. But the main thing that keeps me from going back to it is this. Last three installs/upgrades, it has blown away any profiles I've built up - preferences, bookmarks, saved passwords, home page, and the like. Opera's bookmark import transaction is overly awkward.
Did you install alphas or betas? I think they use a different folder for settings to avoid nuking your standard (stable) settings.
Could that be what you are seeing?