How does the FFGL Feedback source work?

[gpvillamil]

Can't seem to get it to do anything... I've done the usual technique of adding it as a layer, then playing a clip in another layer with a variety of effects and blend modes.

[VJzoo]

dito havent been able to get it to work at all

[edwin]

Hi,
Hmmm.. the feedback seems not be working. Strange thing here that it does work in Debug mode but does not in Release mode. Weird!
It does work in OSX though which makes it even weirder.