Section 3 of the PDP User's Guide to shows that the red blink indicates "No CAN Comm."
Is the PDP's CAN port wired to the end of the CAN bus harness? If there are no other CAN devices then they go right to the roboRIO's CAN port. Also confirm if the the termination resistor jumper is set to the "ON" position.
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enabling the robot does nothing (Even though there is code on the roboRio it doesn't run and the code is bug-free; We tested it already on our other practice bot that used the old cRio). As the programmer, I'm thinking that it might have to do with the flashing red lights STAT and COMM
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So the symptom you are trying to fix is: why the robot doesn't move after you deploy your code? Are you using Talon SRs or SRXs? CAN or PWM? I'm guessing Talon SRs since you went back to the cRIO. Does the DS confirm you're teleop-enabled? If so are the Talon SR LEDs solid orange (neutral zero) or blinking orange (no signal)?