[Ultimate Branding] Problem importing Ultimate Branding Settings

on a fresh website I have problems with Branding, when trying to import my standard Setting that do run on a bunch of installations. Obviously there is something installed and imported, since the main menu entry appears as usual. But all sub items like import or login screen do not work, the wordpress dashboard is not visible any more. when i deactivate UB via FTP, everything is fine again. Looks like an error during the plugin installation to me, but how to fix it? Thanks for your kind help.
Best regards, Sebastian