I started the game, went to fullscreen mode, settings, all low, cycled detail to high, then cycled screen percentage from 40% to ~33%, to error. Now every time I start the game I receive the following error after selecting fullscreen or windowed mode:

"Out of video memory trying to allocate a texture! Make sure your video card has the minimum required memory, try lowering the resolution and/or closing other applications that are running. Exiting..."

The game was running fine before changing settings, now I can't change them back. I tried deleting and re-acquiring Engine\Config, and everything but Content in Mind_Pathtothalamus only to be greeted with the same error. Tried -REGENERATEINIS and other UE4 launch parameters too, plus NVIDIA custom settings.

I have an 8800GT with 512MB VRAM, sure it's ♥♥♥♥ but it runs other UE4 games including the editor just fine. Other specs include Windows 8.1 64bit, 8GB RAM, G3258.