I recently setup Colecovision, or at least am working on it, and Pause do not seem to be opening right. I can hear the Pause music playing and the screen flashes a few times but everything is just black. I had this problem with Dolphin when the emulator wasn't set to full screen, so I did that with Colem and the screen is still black. Interestingly enough, turning on the debugging log fixes the issue... :facepalm:
RL Log
RLUI Log
RL Log
RLUI Log