I don't play Sandstorm with an Xbox Controller, but there are some games where I prefer it (Dark Souls and Assassin's Creed games, typically). So, I have my spare controller permanently plugged into my desktop to keep it charged and also have easy access to it.
Here's the problem: Sandstorm will sometimes randomly switch to preferring my controller, despite my mouse and keyboard being the only active controllers at the time. Today, when I unplugged my controller in an attempt to fix the issue, my game completely locked me out--keyboard did nothing, mouse did nothing, and plugging the controller back in did nothing. The game just went on around me and I had to alt+F4 and start over.
I can't figure out what is triggering it, because it seems to happen randomly without any interference on my end, but it's an issue I thought worth mentioning.