I had a similar problem with tmux in HyperTerm. The fix for me was to run tmux with the -u flag (tmux -u). This tells tmux to explicitly use UTF-8 and solved the problem. Maybe something wonky is happening with UTF-8 in your shell or vim configuration?
Ah! Interesting. Ok, so I added set encoding=utf-8 to my ~/.vimrc, and that fixed it! Thanks for the suggestion.
set encoding=utf-8 corrects that problem with NERDTree but what about vim airline and its icons?, does anybody have the same problem?
@LagartoSeb, after setting encoding=utf-8 in my .vimrc file, vim airline start working again. Are you using the patched fonts for that plugin? (In my case, never worked with std fonts..).
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Ah! Interesting. Ok, so I added
set encoding=utf-8to my~/.vimrc, and that fixed it! Thanks for the suggestion.