No dice.

I unchecked "Enable Hardware Mouse Cursor" -- same thing happens. Using the software mouse cursor, the problem is even more apparent. It's not a camera thing, it's got something to do with how the game is processing input. With the software mouse, the cursor itself will freeze in place every few seconds, then instantly jump to another place on the screen.

I disabled SLI -- no change.
I turned off my virus scanner -- no change
I switched to Windowed mode -- nothing (seriously guys...is it that difficult to tell your program to render a borderless window?)

I also see the problem when I click and drag UI elements around the screen. They'll follow the cursor, but every few seconds they freeze in place for a half second, then jump to catch up with the cursor. As I type in the chat log, every few seconds it locks up, then all the letters I typed during that half second freeze will suddenly appear all at once.

I know this looks like a minor issue, but it's one that makes the controls so frustrating for me to use, the game is unplayable. I'm completely at a loss as to why this is happening, and it looks like I'm the only one seeing it. I don't know what else to try.