Perhaps simple to fix, but in my Sublime when I tab complete it adds an additional angle bracket for HTML, this making it pretty useless as a time saver.
e.g.
<h1>header</h1>
becomes
<<h1>header</h1>
Let me know if you need any additional information to troubleshoot this.
Thanks
This has been reported dozens of times and is a known issue with the current version of Zencoding. More info here.