Demon's Souls freeze on loading screen from Nexus

I've been trying to get Demon's Souls to work, and everything goes perfectly until the first warp out of the Nexus to Boletaria at the first Archstone. It throws an error and freezes completely on the loading screen. I've tried everything in the quick start and support guides, but nothing's changed. I'm on the latest build, 0.0.5-7355-d6dc1493 Alpha. Logs are attached and there's a link to my settings below. For quick reference, the error is "F {PPU[0x1000009] Thread (Core.Res.CacheDeviceHandler) [0x00a8ca6c]} MEM: Access violation writing location 0x0". Any idea what this might be?

PC Specs:
CPU: i7-4790
GPU: GTX 970
RAM: 16GB
OS: Windows 10 Pro
Video Driver: GeForce Game Ready Driver Version 399.24

Screenshots of settings: https://imgur.com/a/ILYgCE0

Logs:

  RPCS3.7z (Size: 1.19 MB / Downloads: 1)

  TTY.7z (Size: 288 bytes / Downloads: 1)