I installed Penumbra on my Intel Mac (10.6.8) w/ Crossover 9.0.1 not long ago. Every time I try to start, regardless of how I change graphics settings or emulate a virtual desktop, the game's menus appear to load normally, but actual gameplay is blocked out except for a white dot. I have no idea how to fix this. All my subtitles or other prompts appear normally, but there is nothing else visible aside from that dot in the centre of the screen. I have attached a screenshot for review: