Try doing a new and reset.
While opening a new file, File>New hold the alt/opt key down and it will say New and Reset. This won't hurt any open files, although I'd close them. This will restore the default settings.
HTH
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"