Are you using 13.8.1 ? if not - update, if you do - try resetting your preferences - Ctrl+Alt+Shift right after clicking twice on the App and you will get a dialog box to reset your preferences - click O.K.
From my experience, the drawing error is coming from the Audio Panel levels being drawn. Why, I have no idea. But I know when I close my audio panel, the errors stop. As to why your audio won't preview, I'm not sure.
I can verify that the "Unspecified Drawing Error" ceases to become a problem once the audio panel is closed. However, there is still no audio accompanying a RAM Preview.
Using AE 2017 version 126.96.36.199. Someone please get to work on this.
Try turning off the hardware accelerate...panels option in the preferences and see if that helps.