I've added the 4-pin crystal in the picture - and now, even though my clearance rules are 0.2mm min, it's constantly complaining about there being a collision between the crystal, the IC, and the resistor. If I move the crystal away from either by about the same distance as the width of the crystal, it's fine, but then it's miles away! The footprint for the crystal doesn't have any hidden exxtended parts, either, the extremes of the footprint are literally the corners of the pads.
Any ideas what's going on here?
cheers