I have vim, and like the Tex conceal option. Specifically, if I have let g:tex_conceal="sabgm" in my ~/.vimrc, whenever I type $\beta$, I see β. But, after switching color themes, I get some weird output:

I have vim, and like the Tex conceal option. Specifically, if I have let g:tex_conceal="sabgm" in my ~/.vimrc, whenever I type $\beta$, I see β. But, after switching color themes, I get some weird output:
