wtkad - 3:59 pm on Mar 23, 2010 (gmt 0)
I didn't get an option box like yours, but I've now set in the preferences to notify me rather than installing updates automatically, so hopefully that will trigger it next time. It was set to notify before I installed 10.50, which is why it caught me off guard today.
I found a comment on Opera's blog where someone mentioned Opera being set as default, so I'm not completely alone. Maybe it has been fixed now? I hope so, at least. I don't know when the update was actually downloaded - could have been yesterday while it was running, or this morning when I opened it.
Saw a few other comments that said the "Windows Native" skin is not "native", so that may be the cause of the skin change I've noticed. Mostly personal preference, I suppose I'll get used to it. But still disappointing that it would lose my customizations in a minor upgrade.