I have the same problem, 3 galleries on same domain but no forum available for bridging; I tried to modify includes\init.inc.php
$CONFIG['TABLE_PICTURES'] = $CONFIG['TABLE_PREFIX'].'pictures';
$CONFIG['TABLE_ALBUMS'] = $CONFIG['TABLE_PREFIX'].'albums';
$CONFIG['TABLE_COMMENTS'] = $CONFIG['TABLE_PREFIX'].'comments';
$CONFIG['TABLE_CATEGORIES'] = $CONFIG['TABLE_PREFIX'].'categories';
$CONFIG['TABLE_CONFIG'] = $CONFIG['TABLE_PREFIX'].'config';
$CONFIG['TABLE_USERGROUPS'] = $CONFIG['TABLE_PREFIX'].'usergroups';$CONFIG['TABLE_VOTES'] = $CONFIG['TABLE_PREFIX'].'votes';
$CONFIG['TABLE_USERS'] = $CONFIG['TABLE_PREFIX'].'users';$CONFIG['TABLE_BANNED'] = $CONFIG['TABLE_PREFIX'].'banned';$CONFIG['TABLE_EXIF'] = $CONFIG['TABLE_PREFIX'].'exif';
$CONFIG['TABLE_FILETYPES'] = $CONFIG['TABLE_PREFIX'].'filetypes';
$CONFIG['TABLE_ECARDS'] = $CONFIG['TABLE_PREFIX'].'ecards';
$CONFIG['TABLE_TEMPDATA'] = $CONFIG['TABLE_PREFIX'].'temp_data';
$CONFIG['TABLE_FAVPICS'] = $CONFIG['TABLE_PREFIX'].'favpics';
$CONFIG['TABLE_BRIDGE'] = $CONFIG['TABLE_PREFIX'].'bridge';
$CONFIG['TABLE_VOTE_STATS'] = $CONFIG['TABLE_PREFIX'].'vote_stats';
$CONFIG['TABLE_HIT_STATS'] = $CONFIG['TABLE_PREFIX'].'hit_stats';
changing users links to the "master" database; teoretically it should work, if I create a new registration from gallery 2 and 3 the user is created rightly on master gallery 1, but during login the user is not recognized, why?
Login.php doesnt refer to init.inc.php to check users?Please could you help me? It's very important for our website, 3 registrations and 3 logins are extremely uncomfortable for our users

and I can't make a single gallery because every gallery has different permission upload (only files, only images, different compression values for jpg)
Thank'you!