using Paul Dore's OFX, all the effects with alpha channel enabled show what looks to to be a premult error;
- ofx ISSUES2.jpg (99.92 KiB) Viewed 348 times
this is new in v15.1.2, the same OFX present correctly in v15.0 or v15.1.1
his OFX without alpha enabled are good as gold in 15.1.2
on LGG he thought this was perhaps the cause;
Addressed an issue where RGBA images would not be processed premultiplied when using some OpenFX plugins
and he offered this thought;
The plugins that are affected all have some form of internal alpha channel or were recently written/rewritten, which may have something to do with it.