Okay, got this sorted (Duh!)
After putting my hand on the router and trying to feel the "pulse" of the reduced feed rate, I didn't feel it. I thought it had been moving, because Mach3 was showing the numbers change, and the increments had been so small I didn't notice before.
My cord was too tight and disconnected when I moved the access across my table. Duh!
-Newb on a Mission