Get the Opera 10.0 version, the problem will be gone.
It's a bug in Opera itself, even well documented on their own bug tracking page.
Oh yeah, pirhapac, about Internet Explorer logging you out
(well I assume you're using IE right?)
1)
You need to enable cookies, go to:
Internet Options => Privacy => Accept Cookies
OR
2)
Add the website to the list of trusted sites!!
Then the site will work fine.