Never mind...

Weird results... still there.

Turns out that during the period of my observations, they had some trouble with the instrumentation labeling sources incorrectly. So my calibrator was called by the name of my target, and vice-versa. CASA, apparently, knew about this, but AIPS did not.

So when I went to look at my target in AIPS, it was a point source. Which it should have been, because it was actually the calibrator. And then my calibrator was extended. Which it should have been, because it was actually my target. Did you catch that?

Un-poof.