How can I disable code folding in vim with vim-latex?

I have tried the usual approaches, and have read :help tex.vim (see : http://vimdoc.sourceforge.net/htmldoc/syntax.html )

I've taken a brief look at syntax/tex.vim, but can't see how to disable it without rebuilding vim without folding. I'm sick of hitting 'zE'.

Lines I've tried in my .vimrc:

set foldlevel=manual
set foldlevelstart=99
let g:tex_fold_enabled=0