I don't know why, but all of a sudden when I try to launch with a performance tool, Instruments launches, but nothing else happens. Instruments doesn't even open the performance template I chose, and the game doesn't launch. It was working about an hour ago, so I don't know what the deal is. Any ideas?

I dunno. I've always had trouble getting shark/instruments to work. Usually restarting the device, reconnecting it, and connecting directly from shark/instruments has far better luck.

I haven't tried in a few days to see if its still happening but I used shark fine for a while, then last time I tried it complained that it could not get debug symbols on the device, and the output was pretty much useless. I confirmed that I did indeed have symbols on too. Not sure what was going on. When it works though its wonderful.