Hi, I have exactly the same problem........here below my setup:
Only one PC with win7
Ableton send the midi note in order to start the video (mov) in resolume
ableton send midi sync
Resolume started the video when received the midi note from Ableton .
After some minutes the numbers of bmp are sync between ableton and resolume but the video is a bit in delay.
I tried to change from BPMSYNC to TIMELINE but the problem appear every time.
Please help me, Thanks