For my accounts I use 60+ character passwords. After installing CB, these don't work any longer. When resetting the password, I can login again. Changing my password at the frond-end in my CB account back to a 60+ character password works fine. Login out and login in after saving the long password, I can't login any longer. Seems like a bug to me...
Or at least a lack of field validation and making Joomla a little less safe. Around the 48 characters is the longest password you can use.
Using Joomla 3.2.1 and CB 1.9.1
Cheers,
Robert