So far, everything seems to work. No crashes, no garbled output. It works.
However, it seems that the dithered-smoothing operation could need a little more work. Example: Pretty dark Intro of an average DVD show. Target operation: Levels(16,2.6,235,0,255,false).
Source frame:
Results:
The smoothing of the dark blocking isn't as effective as gradfun2db. Also, there is a problem at high-contrast transitions.
(Sorry I didn't cross-check if it's the same with the 32bit build ... funnily, on the new machine the Avisynth64 setup is more complete then the 32bit counterpart...)