OK. Making progress. If I switch users from one to another, it keeps recording screenshots for the one that's no longer the active user. Which setting would be the best one to use to prevent that from happening? Since I had to activate it for all the users, I don't want it to keep recording for users that aren't actually active.
What does the "Check for and ignore blank window contents" setting do? The help bubble thing says something about the active window changing but I don't think that's right. it says the same bubble information for a couple different options.