[TxMt] Comments automatically continued to next line?

Hello,

After a recent update (I'm not sure which one) to TextMate, I'm finding that every time I write a comment in Python:

# whatever

and press Return at the end of the line, that TextMate is filling in "# " at the start of the next line. This is really getting in my way, and I'd like to turn it off -- but I can't find which trigger is responsible for this.

I thought at first it'd be the "Continue Line Comment" snippet in the Source bundle, but that triggers on Enter.

Is there any way to find out which command/snippet is responsible for this without going through all bundles one by one?

Andrew