Interesting, maybe it just locks up trying to load that heartbeat sound effect or switching the music track off. I'll keep playing with the CWX Loader and see if anything else comes up, but guess it's just a Pseudo Saturn Kai problem. Thanks!
EDIT: Things are getting glitchy as I play more with the CWX Loader as well. Corruption on character sprites and loading hallways, and I know both are cached in the 4MB cart. Maybe Action Replay's RAM extension is just really spotty and I should get a Phantom chip and a real 4MB cart.