web-admin "users" pages are blank

hi,

installed finally ejabberd on debian5, using mysql. i enabled these odbc-modules:
{mod_last_odbc, []},
{mod_roster_odbc, []},
{mod_vcard_odbc, []},

but when i go to the webinterface to check what s going on, i get a blank users page, regardless of what link it is (users, users online, ...)

what can that b?

thx