Those Truvativ Rouleur cranksets are iffy. I broke one while out testing a bike equipped with a D/A RD, cassette and chain. I was making a left turn and I had the bike in the large chainring and 23 cog. As I was standing up to accelerate onto the side street, I felt something give way and I almost fell to the ground. I pulled over and found that the chainring had cracked at a rivet and had pulled away from the crank. The bike had 1.5 miles on it. Word is, is that it was a freak accident, but I've also heard that Truvativ has redesigned the chainrings for unknown (or known!) reasons.
I'd check to make sure that your chainrings are in good shape. There could be something about to fail, and it's manifesting itself through lousy shifting.