Major render device issues using most recent proton (7.0, 7.16-GE, Experimental). The render target would display in place of the cursor. Although the game displayed in full screen, the majority of the screen would stay black, with the game menus being rendered as a tiny image roughly the size of the cursor and would track the cursor around in place of the cursor icon.

Rolling back to an older version (<= 5.13) allowed the game to render normally. The game launched and played just fine on the older version, though launch options were needed to set a larger window size.