1. Download any torrent.
2. Stop it or exit from kTorrent.
3. Move files to different place.
4. Start kTorrent and this torrent.
5. Press "Cancel" in "missing files" window.
6. Try to start this torrent.

Actual result: torren is in state "Error: Data files is missing" and you can't start it again -- nothing happens. It will be unblocked only after restarting of kTorrent.
Awaited result: "missing files" window appear again after clicking on "start" button.

It's locked in this state even after "Recheck data". Actually same problem with any active torrent. If you accidentally move folder of active torrent and put it back -- you need to restart kTorrent or it will be in "Error" state forever.

I see the problem, will fix it later today