After upgrading my Surface Pro 3 to the latest insider build everything was fine initially, but after a Windows Explorer crash it stopped working, even after repeated reboots. The Processes tab doesn't update itself and shows Task Manager as only running app, performance graphs are all blank with the CPU fixed at 100% even though this is clearly not the case. Detail tab seems to work properly.

EDIT: As per advice I've run system file check, yielding "Windows Resource Protection did not find any integrity violations."

EDIT 2: Turns out View>Update speed was set to Pause. As it clearly says in the screenshot. Time to feel stupid.