Litecoin mining 10 times slower than a couple of days ago I have a 5850, and have been mining with it for about a week.

With GuiMiner I can mine bitcoins at about 275Mhash/s.  This has not changed.

A couple of days ago I setup Litecoin mining and it was working at about 350Khash/s, which at the time was about the same profit as Bitcoin.

But now when I mine litecoins I'm only getting 35 khash/s.

I'm getting the same speed with CGMiner or Reaper.  I just started the exact same setup I had last week and I'm getting the crappy result.  I've been messing with settings and config, but no change.

I have rebooted, no change.  I can change back to Bitcoins anytime and get 275Mhash/s with CGMiner, but when I change CGMiner to Scrypt mining it drops to 10% what it should be getting.

I can't think of anything that would cause this.  Any thoughts?

Scrypt CGMiner mining:
http://puu.sh/2d7Mp

Bitcoin CGMiner mining:
http://puu.sh/2d7NW

Current CGminer command:
cgminer --scrypt -o x -u Liquid5n0w.1 -p x --intensity 12 --worksize 256 -g 1 --lookup-gap 2 --thread-concurrency 7200  --fix-protocol
I have found the cause:

I had GUIMiner to start on startup, and even though I was stopping it before I'd try to use CGMiner or Reaper, it did something to the drivers and would prevent LTC mining from starting correctly.

If you have a similar problem to this, try to disable GUIMiner on startup.