[Brian Selle]

I've tried it 3 times plugged into ports 1/2 and each it's same behavior... fine in disabled, crippled when enabled. I've tried it once in port 9/10, 11/12. and 13/14 and these all worked fine. I have two identical encoders and both exhibit the same behavior when plugged into the same wiring.

We don't have an oscilloscope. I checked the voltage using a multimeter on the A and B channels and both where 2.5v when the encoder was spinning.