Simple script (syntax: php):
<?php $text = ""; ?>place text cusor between tags style (" right there "), press Enter and then press Tab. Thats all - sublime hangs up. I guess that trouble can be in some plugins. I asked my friend to test it - result was just the same (he has only 4 installed packaged - Package Control, Emmet, HTML-CSS-JS Prettify, PyV8).