I have a Nikon Coolscan V-ED....It has worked flawlessly until this evening. I was scanning some old photos and came across a roll that it will not scan. It's a roll of TechPan that I did some weird development to...Can't remember but the negs are very, very contrasty. They look thick....if this makes sense. Anyhow...Only this roll will not scan. I get the machine gun noise and the scanner stops and I have to pull the adapter out and manually remove the negs. I can scan any other negs without a problem....before and after this roll. Anyone have this issue?