This question is no longer relevant. As of last evening, an update was issued from Windows Update that resolved all graphical issues. The only remaining issues are performance with this Nvidia 750M dGPU.
Howdy! I'm currently running the Windows 8.1 RTM for development purposes. My issue is one that I also ran into with the Windows 8.1 Consumer Preview. Namely, any 3d game will not run. They'll display a variety of issues from inability to create 3d device to no supported driver found. These games run splendidly on Windows 8 Pro x64. I assume these issues are all related to Dell's hybrid Intel 4600/Nvidia 750M setup. Is there a timeline for updates for updates to these devices to be released?  Sincerely, Happy Customer
Windows 8.1 Graphics Driver