Yes, it is odd that it stopped working after it was working. Most likely it’s something simple.
I’m assuming all the switches on the dip switch are in the off position, correct?
I’m also assuming the ribbon cable is installed the correct way around (not twisted)…and has been calibrated AFTER it has been installed correctly. If it was calibrated when it wasn’t connected correctly then the microcontroller will have bad data and it won’t pass signal.
I’m also assuming that the jumpers, J5 and J6, are installed.
Just to make sure the jacks are working correctly…while the main board is in the chassis and the pedal is powered and plugged into an amp and guitar, try to firmly wiggle the input and output jacks as you play guitar….just to see if the signal jumps in and out.
Please check out those things and let me know.
Good luck!
-Brach