I noticed yesterday when I attempted to checkout the openacs-5-0 *branch* that no files were retrieved. I saw a listing of the directories (not sure if all dirs were returned). So, I'm thinking that each file in the 5-0 branch should also have the openacs-5-0 tag. That way, to get the latest 5-0 release, you simply checkout with the openacs-5-0 tag.
Does this make sense? I'm fairly certain that it *used* to work this way.