Hmm. We know it's not the Mac, or the OS itself, or the same issue would have followed to the new user account.
Something, somewhere in the preferences or installed apps of the account you normally work out of is the problem. The question is, where?
If you login to your account in Safe Mode, does it work correctly then? It should. That would again point to something in your account that is active when starting up normally.
Per the idea it could be a corrupt preference file, open the Preferences folder in your user account and delete this file:
com.apple.systempreferences.plist
Restart immediately afterwards and test. If you prefer, move that .plist to the desktop rather than delete it. If that isn't the problem, you can put it back and restart again. The purpose there being you won't have to manually reset a lot of system preferences back to your liking.