-The Metro version of OneNote flips out and becomes unrespnsive to pen input (10-15 second delay) while RadialMenu is running.
-The toolbar reads raw input at all times to see if a finger is over it, this includes when in the Metro UI as well and it doesn't care if it's not the active / foreground application.
So if anyone is seeing strange behavior, try closing RadialMenu. I'm working to fix this and hope to have it resolved before the next release.