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Re:Xi: an editor for the next 20 years [video] by neoncontrails on Tuesday January 30, 2018 @10:32PM (#16271069)
Not sure if it's the same issue I had recently with iTerm2 periodically going black, but consider disabling the Core Text renderer with the following command:

$ defaults write org.vim.MacVim MMUseCGLayerAlways -bool YES

This was the developers' suggestion and it solved my issue. There's an informative discussion of the root causes here: https://github.com/macvim-dev/macvim/issues/557.

Re:Xi: an editor for the next 20 years [video] by bhoeting on Wednesday January 31, 2018 @02:30PM (#16276786)
Hmm, that didn't see to work for me. I think I have a different issue. Thanks, though!