joomla gallery2 user synchronization stops

after the port of my joomla site i had the same problem with the g2 picturebridge like i had when i implemented it the first time ... the user synchronization just stopped without any further progress and without any error message

if you have the same problem try to setup all of the users you see in the user management dialog of the gallery2 component in gallery2 manually - then try to do the sync - now the problem should be gone ...