I'm still relatively new, but have actually had success with logins before.. ;-)
Environment: Apple Mac with English OS (10.6.1) and a German Keyboard; VirtualBox 3.0.8 r53138 (up-to-date); Firefox 3.5.3; Safari (4.0.3 6531.9)
I first installed the aforementioned software using a standard password (all alphabetical except for one "-" sign) for all entries. I was able to login into Drupal using this. I got login errors on all https web sites for both admin and root.
I then reinstalled using "turnkey" as the password for all entries. Same result as above.
Has anybody seen this before? I remember this happened with the a previous version and that it all somehow worked out in the end... no such luck this time. Any pointers?