Hello!
I discovered what I suppose to be a bug:
I have a clip set set to BPM Sync mode in Transport controls and playback mode is set to Random. When I change Distance value it works ok until next relaunch of Arena (yeah, I remember to save composition before closing App). Then it resets to default value of 8. The clip is encoded with DXV3 codec. Arena 7.05 rev67117, OSX.