getting strange coloured blob artifacts in output

[Statick]

I'm getting these random black and coloured blobs in my output when using neo_dfttest. default settings except sigma=8

these screenshots show the problem, the blobs are completely random and happen at different frames/locations every time the script is opened, each one appears for a single frame only. and sometimes if you step past a frame with a blob on, keep going for a while, then step back over it, they don't appear the second time, or frames that were clean the first time now have blobs on. they are definitely not present in the source, and if I disable neo_dfttest then they stop happening altogether (currently using OG dfttest instead as I don't get this problem with it). the script these screenshots are from only has two filters, d2vsource and neo_dfttest (it's not even been field matched yet, this problem still happens with clean frames though)

I'm not sure if they're happening throughout the entire video as I've only just noticed them on this intro, where they are easy to spot, but I suspect they are

[Asd-g]

You can test different opt values.

Also you can test threads and/or fft_threads with different values.

IIRC the original dfftest uses threads=1 by default.