I am having trouble with a symbol that I created. It worked fine for a time, but I changed the schematic and now for some reason I cannot get a net to land on any of the pins. Also I notice that the symbol disappears at moderately high zoom levels. I have made sure that the symbol border is within the perimeter of the pin connections, so I do not think this is the problem.
OK, I got it to work. It was related to the symbol outline. In this case I had moved it well within the perimeter of the part. For some reason I guess it has to be in line with the pins.