Nick, it's totally strange: input and output of the eq are both set to 0, and clipping does not occur on the input but on the output, *when* that slight cut is made at 2khz. Without the cut, it doesn't clip. No other variables going on; nothing else on the track, and it's clipping right there on the track, not out to a summing bus, etc.
I guess the next thing to do would be to try this with a different eq. Maybe something funky is happening with the digi plug-in. Or maybe there really is some kind of auto-boosting going on that I can't see in the interface.