Nerd tree: enter does not open sub dirs

Question

I installed NERDTree via Pathogen on Mac OSX 10.6.8.

When I vim a dir, I cannot enter into sub dirs with enter key. Furthermore, the dirs look like this:

Answer 1

I followed jernkuan's answer but didn't work. What worked for me was typing :set encoding=utf-8 inside vim But I lose this when I exit out of vim. I have to do this everytime I am on vim