[kamocat]

No, I just have an O-scope. (I don't think it'd show me much in this case, or I would use it)
The battery was low, so I put the bench-test on an external 13v supply. No change in response.
Should I try running a Driver Station, to see if that makes a difference?

I guess this brings up the other question:
How easy is this board to fry from heat or static electricity?