I hope it's the answer for you, as I know how frustrating these problems can be, and how tedious further testing will be for you. If I get time tomorrow I will dig out a negative with the same problem and scan it to post here.
Cheers and good luck
Originally Posted by adelorenzo
Well now... That would certainly be a simple explanation wouldn't it? I did have the hood on the camera and I have never really paid attention to lining up the white dot. I'm going to test this theory out but this could be it....