If you are having problems with javascript in Opera, I would really like to hear about them so that they can be fixed. There is a bug report form at [1], or reply here. Obviously it is nice if you have a reduced testcase, but just knowing that a site fails is immensely useful.
http://www.questionhub.com/StackOverflow/3899985
Aggressive opera caching and different behavior from others browsers is not what I like.
This is a known issue. No promises, but it looks like a fix might be ready sooner rather than later.
http://groups.google.com/group/google-maps-js-api-v3/browse_...
It's not instantly obvious to me what the problem is here, so I will need to investigate further.
Thanks for the bug reports!