Video In Crashes

Ive been trying to figure why this happens but cant seem to find any obvious reasons, whenever i open the video in node in Beta 20 and 19.1, after about 5 seconds vvvv stops responding and has to be sut down. If I try and open a blank patch imediatly v4 diesnt respond but if I try again about 10 minutes later v4 opens wothout any problem.
The TTY renderer doesnt show up anything special either. Out of interest img going to try beta 17 and beta 18 now.