I think I isolated the problem on my new rig... My 5870 apparently does not like me to tell it what thread concurrency to run at. When I take thread concurrency out of my bat file (regardless of its value) cg miner runs properly. Since I am unable to set thread concurrency, the highest I was able to get my Sapphire 5870 was around 360kH/s.
BTW, that dodge thing doesn't make any sense to me, the fact that you can get 10 times the LTC by mining dodge and converting...that's just blasphemy! I'll have to get started on it right away!