- Open a CSS document
- type h1. Note it inserts a head comment snippet
Note that it should wait until you have typed "head" as that is the full activation trigger (Commands > Source > Comments > Insert Comment Header)
A different cause, but similar end result:
- Open a HTML document
- Type "com" + Tab
- See ⌘ inserted into the document
TextMate does not complete activation triggers unless the whole text is entered.