While I was testing for something else I encountered a behavior that if my memory is good wasn't behaving the same way in MC12, or maybe 13, 14 anyway it does not anymore. You do bunch of modifications to tags so MC writes in the status "Saving blah blah blah". While it is saving you close Media Center. But the process still runs in the background until it finished the savings. Before we had a popup that was saying Media center is saving tag with a cancel button till it finish. Where that went? Because if you try to reopen MC you receive an error message saying that media center is still running and cannot open a new instance. While I can guess what is going on behind, it is not for the average user.