I redownloaded and unpacked in to an empty folder and still had the problem with the hover pop-up.
The pointer feels like it is lagging slightly behind on the title screen. Like if I move it, it takes longer than it should for the pointer to go to the new position. While in-game (inventory screen , etc.) the lag is much less noticeable but is still not the same as the hardware pointer.
I am testing it on my laptop from work, which may not have the latest graphic drivers, so I suppose it is possible that the drivers are contributing to the problems. nVidia Quadro M1000M driver version 377.61. I can't update drivers since that is controlled by the IT dept.