Several times I've seen the task manager appear frozen in Windows 8. It doesn't update, and generally shows double-digit CPU usage. Closing it and reopening it doesn't usually help, but rebooting generally does. How does this happen, and how do I fix it?
I've found my task manager doing this as well. Not sure how it got paused, but when I set the update speed to normal it gets going again.
Edit: To change this setting, go to View > Update Speed in the top menu.