tjfriese: Anyone? No one has experienced this before?
Yes...;) That is normal. In full screen mode you are walking, and the cursor disappears. Slide your mouse forward to move forward, turn mouse to left or right to look left or right, use up & down cursor keys to look up or down, etc. When you approach an object that you either want to examine or open, as in the case of a door, hit the spacebar, and you revert to look/action mode and the cursor returns so that you can examine/use/take the object. Hit spacebar again, and you go back into movement mode--cursor disappears because you do not need it.
Running Win8.1x64, no problems. In the off chance this is *not* what you're talking about, then all I can say is the game is running fine for me under 8.1, so there's no bug here than I can see.