@weslly: i had the same issue. You can either disable completion or add this into emmet.sublime-settings from user directory (if it's not there, copy it from emmet install folder):
// custom snippets definitions, as per https://github.com/sergeche/zen-coding/blob/v0.7.1/snippets.json
This will do.
If still doesn't play nicely, you can try to disable tab abbreviation completely:
(in preferences file) Or bind it to a different shortcut.