After the update from 2.661 to 3.0 / 3.1 i noticed a wierd behaviour of the search function as MT tells me everytime after a search that when I want to search again there is still a search function active.

Looking into my home-error logfile it shows me:

(in cleanup) Can't call method "TempDir" on an undefined value at /home/groups/home/web/mt/lib/MT/App/Search.pm line 117 during global destruction.

Known bug in MT (Mantis bug #0001621). I don't know if this issue has been fixed or not.

where can I track those bug-list?

you might find this thread helpful... some temporary fixes are posted regarding search throttle bug