Rick,
Maybe its the combination of my Apogee F16M and MaximDL, but sometimes I can't get them to play nice together at all. Latest issue is that for some reason when I bring an image into PI the cores of the stars are black when actually they are just saturated. At first it happened with CCDStack too, but then they did a patch and it fixed the problem there, but still other issues. So my current routine, which is a real pain, is to capture everything in MaximDL, then save in CCDStack to clear the artifacts, then save in Nebulosity to get them in a format PI will read properly.
Seems I am alone in these travails, since I have been having them ever since I got the F16M but its time to look for a different solution even if its just a glitch somewhere in my system.
Best,
Jim