Using your last dev version (but I guess the problem is in all recent versions), the parsing of a VapourSynth script (i.e. providing in input a *.vpy" file instead of a clip) will crash Hybrid.
Please see the attached sample.
Uploaded a new dev which should fix the problem, assuming you adjust your script to use an absolute path for the source, since otherwise LWLibavSource will not be able to find the source. (since the reference script location changes to the new scripts)
Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.