We've got pinholes. Pretty bad too! So far it has only happened recently since I started using Neopan 400 more (120 format). I have only noticed it in Neopan 400. It has happened with both Diafine and D76 1+1. I use stainless steel tanks and reels and mix my developers with distilled water, and I use Arista Odorless rapid fixer diluted 1+3, and I have a tendency to fix for a long time (5-20minutes). I don't use an acid stop bath. The only thing I can think of is that the pinholes are being caused by overfixing, or else my camera is damaging the emulsion. These were all taken with the same camera.