I have two b2evo installations running on the same web server

I can log into 3.3.1 from any browser. This was a fresh install.

I can't log into 3.3.2 from either Iron on Windows, or Konqueror on Linux. However I can log in using Firefox/Iceweasel. This was an upgrade from 2.3.?rc?

EDIT
I upgraded the 3.3.1 to 3.3.2. I can still log in there. What could be blocking webkit browsers on one but not the other?