Thanks for your reply, Niko!
Replace announce.php with attached version
OK, the new annonnce.php got rid of the errors.
(By the way these errors only occured when connecting with BitTornado and BitTorrent clients.)
Still, can´t get any transfers to start, everything looks good in tracker statistics, leechers and seeders
show up but no bytes transferred.
When I save permissions I get errors in forum log:8: Undefined index: permissionname_tracker_edit
8: Undefined index: permissionname_tracker_edit_own
8: Undefined index: permissionname_tracker_edit_any
Furthermore, there are two tracker permissions with no "name" !?