Also, if you open MacVim from the command line, use open -a MacVim instead of mvim . The full screen did not work for me (I open a lot from the command line), but a friend shared this little tip, and now the full screen mode is again functional. Using open -a MacVim also allows you to use your own full-screen mode.
I am running MacVim on Yosemite version 10.10.2.
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