I see what you mean Sharp. I've just been playing around with the Heavy Metal skin and noticed that. At first I thought it may have something to do with accessing a database withing the skin database directory, but it didn't seem to make any difference. I would say that is unique to the skin, as if I try my own skin, it updates immediately. I'm looking through the Heavy Metal skin to see what is so different about it, but nothing so far has jumped out at me.
It could be something in the way the Heavy Metal skin's category is setup. Have to look further into it.
Hope this was helpful.