Help with Crispy Doom U forwarder

[GBAtemp]

I'll keep things concise. I made a forwarder for doom by replacing the RPX of a wii u vc title with the latest version of Crispy Doom. the game loads, and I can hear it, but the only thing I can see is the WAD selection screen before it goes black. how do I fix this?
EDIT: I know for a fact this method works because I just swapped Doom for Sonic CD and it works flawlessly.

Source: https://gbatemp.net/threads/help-with-c ... er.644376/