Hello,
Downloaded filters are stored in ~/Library/Application Support/FilterForge/System/Library/
Your own filters are stored in ~/Library/Application Support/FilterForge/My Filters/
(~ = your home directory )
I don't have PS, so I cannot say wether it works or not, but I run FF as a stand alone app and it works pretty well, except a crash when submitting to the library, which is still there.
I use to process 7x10 or 15x10 inch 300dpi images quite regularly using FiltrForge.app running SnowLeopard, so I guess your problems are related to PS+FF.
Hope some of this helps.
Cheers,
// Totte
- I never expected the Spanish inquisition