I occasionally have the problem with Spaces (in both 10.5 and 10.5.1) where active windows for an application stop showing up; this seems to be a bug with Spaces. One solution has been to disable Spaces and re-enable it. But using the scripts from this earlier hint, I can use the "Collect on Current Space" script to get all the windows to show up in whatever space I'm in, regardless of whether they would show up before.This is a real lifesaver when unsaved changes are in a window that won't show up.