Hi Ernesto,
I’ve had the same problem (Remove Grain just doesn’t seem to work) and was glad to find your advice. However, this doesn’t do it for me. I’ve been setting the source frame to every other frame of the clip and the plugin still doesn’t remove any noise.
Funnily enough it does work on a few other clips in my timeline, but there are no differences (e.g. opacity, file format, or additional effects) between these clips and the ones the Remove Grain doesn’t work on.
Have you got an idea?
Best, Phil