Help, Virtual dub crashes.

I have ripped the movie Dune (pal) with smartripper. Then I have used DVD2AVi and VFAPIconv to frameserve it to Virtual dub. In Virtual bud, I have added to Vobsub filter and frameserved that to TMPGEnc. After about 5 minutes, Virtual dub crashes.(and yes, I have installed the frameserve client)
I am not sure if the VOB files are the problem, because when I frameserve it directly from the D2V file into TMPGEnc, then there is no problem.
I did not have this problem before, but I would know if anyone could tell me what could have caused this crash.
I know that I gave minimum of information, but that's all I have. All suggestions are welcome.