When I'm opening macvim in full screen mode I have black stripes in bottom and top. So I can't see some part of code.

In none full screen there're no black stripes.

Is there a way to get rid of these stripes?
I found this post that seems to address that problem.
Full screen MacVim on OS X Yosemite
$ defaults write org.vim.MacVim MMNativeFullScreen 0
Great, it worked !! thanks for confirming for others to find and use.