Quantize Drums Crazy

  1. Create folder track
  2. put the drum tracks in the folder
  3. Create hit points from a track
  4. Create slices on all the tracks
  5. Apply Quantize

Result: Tracks (Tom 4 - Over Heads - Rooms) No sound

What is happening?
Any help is welcome.

maybe CPU- or soundcard-overload/-congestion?