You might have to update the OS.
As Dave says, there are problems with versions of Mac OSX v10.10 before 10.10.5. If you're using Mac OSX v10.10, be sure to update to v10.10.5.
Because of where I work and the tight security , I cannot update my OS yet. I was able to download a previous version off the website and everything seems to be working fine now. Thanks!