Got my USB today. Thanks for the fast shipping / order processing, Mitty.

Seems to be unable to mine just in LTC mode, mines both just fine though. I'll tinker with it over the weekend.
No problem, glad it got there quickly & safely.

Did you make sure you set the tiny switch on the unit itself to "L" mode for Litecoin only?
Let me know if you still can't get it working and I'll contact DualMiner for RMA info right away.
Yeah, I made sure it was set to L.
Everything installed fine, pool info is correct, all the basic stuff I checked.
I can set it to mine both, switch it to B, and it'll work no problem. Set it to mine both and leave the BTC pool info blank and it'll mine just LTC fine. I can even set it to mine both, leave the switch on L, and it'll mine only LTC but KH/s is exactly as if it were mining both.
Set it to LTC only and it won't mine at all. I haven't found a way to get it to mine only LTC at the expected ~70kh/s.