For the SFXs, nothing happens when I click "Play Youtube Preview". I cleared my cache but that didn't fix it.

I'm having the exact same problem porting Bowser's Castle (MKWii version) over Pictochat. It freezes when I try to load the stage. I have all the files in the right folders in my SD card, I double checked. Also, I'm using Project M, but I don't see how that would affect much.

The only potential issue that comes to mind is that the hack was designed to replace New Pork City, so I used the module converter to switch New Pork City's .rel to Pictochat.

Anyone got any suggestions?