troubleshooting

macOS

• background color in vim colorscheme doesn't work properly in tmux

• YouCompleteMe goes well in terminal vim but breaks in MacVim.

  :echo $PATH in MacVim, see if it's different from which in terminal vim. If not, and you're using zsh, see $PATH in MacVim differs in terminal vim.

• python error in MacVim

  E837: This Vim cannot execute :py3 after using :python
  E263: Sorry, this command is disabled, the Python library could not be loaded.

Windows

• strange gvim inner borders in fullscreen mode

Linux

• get 256 colors to work in tmux