The stock Javascript stuff works all right for me. After just tracking down a problem I was having with indention that turned out to be a dumb line in my .vimrc

The stock Javascript stuff works all right for me. After just tracking down a problem I was having with indention that turned out to be a dumb line in my .vimrc, I'd suggest doing a standard troubleshoot - take out all of your extensions and your .vimrc and see if it still does it. If it stops, re-enable stuff until you figure out exactly what's causing the problem.