Bug or what ?

I tried 2 things With wwf V7.b3 :

1- install the forum with a new database...

2- install the forum with a database was migrated with "the migration tool"

And i have a strange bug (in the 2 cases) : when i logged with the administrator and when a clik on the admin icon on a forum... A blank windows pop-up....(pop_up_forum_admin.asp)... but when i do the same with the pop_up_topic_admin.asp, that's run normally...

I think that's become from the database, but where ???

I don't understand...