Yep, that was it, in fact it was not a view, but a cursor in the Data Environment. I don't think I've looked at the DE of a form for years, so I totally forgot about that.

I'm modifying a form and trying to use some code from another form that does a lookup on that cursor, so I added the same cursor to the DE of the other form.

Thanks - it seems to work now, I can have lunch and take a break..