Re: BitMinter client (Win/Linux/Mac, NEW: BFL and Icarus FPGAs supported)
Sorry, should have clarified - I have been using the silabs drivers. BitMinter works AWESOME with my erupters, but occasionally I get one that always throws those errors and never connects. Totally understand that it's hard to troubleshoot if you don't have one 
Does it help to move it to a different USB port? If you mine on only that device does that work?
one device running has 100% miscalculations 
Did you try mining on only that one, connected directly to the computer instead of the hub? Just to rule out the hub being bad.
You could also try a different miner (I believe bfgminer works with the silabs driver), but the way it finds the wrong nonces all the time, it doesn't look good.