I spent a long long (LONG!!!) time tweaking server side files etc. thinking that the reason that i kept getting "Login Failed" was related to my installation procedure.... but it wasnt, roundcube does NOT work in the latest version of firefox (2.0.0.4). I had been tweaking folders manually in my .mailboxlist file and thought that in the process i had messed something up. I spent 2 hours trying 'fix' my login. Then i tried to login with IE7 and everything worked fine.
Roundcube RC1 Login on:
Windows XP IE7 - Works
Windows Vista IE7 - Works
Windows XP Firefox 2.0.0.4 - NOT WORKING
Windows Vista Firefox 2.0.0.4 - NOT WORKING
I assume the the javascript ajax call or whatever is used to login is not fully compatible with latest version of Firefox.
It is working fine on my side.. Were you able to find the reason behind it?