Sandstorm not closing properly

I'm only noticing this now with the Sep. 2nd hotfix.

Simply put, when I close the game Steam doesn't recognize it. I don't know what to look for in the task manager either (not that I should have to of course, but it's nice to have an idea of how to anyway)

This happened to me too. Steam says I'll still be playing Sandstorm when in-fact the game is completely closed.