So I recently upgraded from Windows 8.1 preview to 8.1 final, thinking it would be better. I didn't actually "upgrade", I did a full new fresh install. Well my GOD is it buggy as hell. Any time I type into any windows dialog related to explorer.exe, whether it is typing in the address bar of Windows explorer, typing in the windows Run dialog, or typing in the command line in a program shortcut properties, the moment I press a single key on the keyboard, that window freezes. It then turns grey, and after clicking on it a whole bunch, it disappears, along with every other open window/dialog, and my start menu, as is the characteristic when explorer.exe is killed.
This is really farking annoying. Anyone have any idea why this is happening? The exact same keyboard (Logitech MK320) worked fine in Windows 8.1 preview on the exact same hardware. This happens whether I used Microsoft's built in keyboard drivers, and continued to happen when I switched to the official Logitech drivers. It does not happen in any software that isn't related to explorer.exe, such as typing in Google Chrome, right now.