Hmmm, i solved the problem just now, after days of thinking what is wrong.
The problem is very illogical for me, but i will write solution here in case someone else stuck with this.
Download scheduler was turned on so P2P service was active in period form 22:00 (10pm) till 07:00 (7am).
But in inactive period (7am till 10 pm) management buttons are inactive as well, which makes no sense. So I could not remove or delete or view info about any torrent on the list.
When I re-enabled download form 0-24 ( turned of scheduler) management buttons became black again and everything works.
I think this should be solved in next firmware upgrade (if any). I am using latest firmware 1.03.