I enabled feature_use_fgal_for_wiki_attachments with a view to trying to test and further develop this feature (and attached some screen shots to a doc page) but it seems the server can't load the default filegal, which seems, weirdly, to be galleryId 5.
I also have to say, i think file galleries have slowed down drastically in the last few tiki releases, which is probably causing the timeouts listing files here. This should be investigated...