Can't open folders in Linux nerdtree vim

I'm having a similar problem using Vim 7.2 and the latest NERDtree plugin (4.2.0).

The odd symbols are because your terminal does not support the new arrows. You can fix that by putting

let NERDTreeDirArrows=0

in your .vimrc

I'm still working on the the more important issue of it not opening directories though.