If it's a problem of dqing instantly due to it being a freerun mod and there's a dojo, you can solve this by:
open the replay in notepad.
scroll down to where it says:
FRAME 0; 0 0 0 0
and delete from there to right above
FRAME 10; 0 0 0 0
I'd look and fix it myself, but I keep downloading blank replays.
I hope that solves your problem.
Make sure you save a back-up.