TomArrow, At a guess, I might think plugin problem. Try Groucho2004 (on current avs+, forget older one)
Code:
AvsMeter -avsinfo -log
Post results.
EDIT: Arh, that pest LigH, is just too fast
EDIT: 64 bit provides error messages because it is not having a 32 bit plugin autoload problem.
Might also want to put ffms2 dll in autoload plugins directory, just to view the AvsMeter results relating to it. (can later remove)
EDIT: Some avs v2.6 plugins compiled with old avisynth header (prior to avisynth 2.6 Alpha 4) will crash if used on Avisynth v2.6 Alpha 4
and later, guessin that this may be the problem (because the older avs+ works ok, probably from pre alpha 4 era).
EDIT: Was your previous Avisynth version, before Avs 2.6 Alpha 4 ?