Hmm, that's strange ...
So you're saying you created a new user account but could not log in with the password you got for that account? I've never used the bridge, but does it require changes to users.php? If so, replace that file with a copy from the Geeklog tarball. Also, clearing your cookies may help.
That's about all I can think of. You might want to contact the author of the CMS bridge - maybe he has some idea what went wrong.
bye, Dirk