Of course I can't reproduce it now! However, about 20% of the time when I try to login to my Gmail account (because my wife is logged into hers), it gets stuck in an infinite redirect loop. I always end up surfing around to different Google sites for a while, and then eventually it fixes itself.Anyone know how to fix this? What causes it? 
What causes the infinite redirect loop when I login to Gmail? How do I fix it?
gmail;google apps;account management;login
A couple things to try:Clear your cookies (if a duration is allowed, I'd try everything)Clear your cache (if a duration is allowed, I'd try everything)Make sure your system time is correct.If none of that works, try logging in with labs disabled:  http://mail.google.com/mail/?labs=0