I have one problem when trying to run the Drillbit8 board on the same pc that runs the Drillbit Thumb - can't get 2 separate instances of cgminer to run with separate settings for the 8board and Thumb.  The 1st instance 'captures' both devices and the 2nd instance is left with 'nothing'.  Does anyone know how to convince cgminer to run a single device out of a few similar ones?  (on Win7).  Both are seen by device manager as 'thumb', the only difference being in the detailed properties where the hub/port are listed, but I don't know how to apply this in Cgminer.

This is necessary if you want to run non-stock settings, which are different for each.  If I run them both in 'stock settings' there is no problem (other than the Thumb getting quite modest hashing rate).

Cheers