yepp, that's clear so far. BUT: I have CHANGED the setting from "yes- show all" to "no" - i.e. only show images that users have uploaded to their gallery.
What I have now is -sounds strange, I know... - member galleries that don't contain any images. Think that is because they have been build during the old setting.
Check here (German - but shouldn't be a problem
Hope you get the point?