I do seem to be getting a few problems with this configuration. The registration process is throwing up some odd messages. Initially, when a a new user completes the registration, a box appears saying "no valid image uploaded", and returns the user to the registration page. It seems however that the details have been entered into the database, as the user shows up, just not enabled or confirmed, and if you carry on registering, contradictory messages appear on the front end saying on the one hand the user is already registered, and on the other, to complete the registration process. This all disappears when the Joomla user profile and image plugins are disabled, so they are clearly causing a conflict somewhere.
I have tried both the yes and no options in the "allow user registration" box in CB Configuration Manager, and set the corresponding options in the Joomla user manager, plus tried various option with image upload in the CB config manager, but the message about image upload still appears. Do you have any idea how to resolve this?