This problem has been recurring for me; whenever I log out, I'm unable to log back in using the same browser. (I've seen this with both Firefox 3.0.1 and Konqueror 3.5.9 under Ubuntu Linux for AMD64.) When I manually clear all the APUG cookies in Firefox (via Edit->Preferences, Privacy tab, Show Cookies, enter "APUG" in the Search field, highlight all APUG cookies, click Remove Cookies), I'm able to log in. Ditto when I exit from either browser and start it up again. I haven't tried manually removing cookies in Konqueror.
Originally Posted by srs5694