Finder windows won't open up
Yesterday, without me doing anything discernible, Finder stopped being able to open up new windows when clicking on it in the Dock. Right clicking and selecting "New Finder Window" doesn't work, and neither does command+N from the desktop. This behavior is also happening under Guest account as well as safe mode. Entering rm ~/Library/Preferences/com.apple.finder.plist in Terminal didn't work either. Other Finder functions, such as creating a new Folder on the desktop, seem to be working fine. I'm not experiencing any other unusual behavior in any other applications.
iMac 21.5″, OS X 10.11