At home I often have problems to log in using opera. At work I have no problem using the same opera version. I click on log in, enter username and password and than I get back to the discussion page being logged out. I currently post this using the internet explorer because of these problems.

Hmm, sorry about that. I'm out of town till Wed, but I'll definitely take a look when I get back.

It looks like it has to do with caching. It's a bit weird. I just clicked on log in, entered my username and password. The "Discuss" page is loaded, but I'm logged out. I press F5 to refresh and I'm logged in. I want to report it in this thread. I can't post, because I'm logged out again. I press F5 again and I'm logged in and can post.

Edit: It seems to happen with Opera on all systems, not only at my computer at home.

Yeah, looks like Opera wasn't respecting my Cache-Control header. Fixed. We'll probably wait till we roll out email to include this fix - which hopefully should be soon.