I have finally brought my bathroom darkroom up to operational status and had my first printing session yesterday. I had the usual "just getting started" issues and worked through them. managed to get a handful of decent 8x10 prints using inexpensive RC papers. But, I have noticed what seems to be a slight problem with my Besler 23c11 enlarger. Almost every print has what seems to be an underexposed portion of the bottom two corners in a radiused shape. I stopped and made a contact print of the entire 35mm roll of negatives to see if it was just light spots on the negatives. They look good. Then I made sure that the head was level and looked for light leaks and anything that might cause this and made another print with the same results. I am baffled. And the strange part is that I am not getting the same result on every print. Has anyone experienced this problem?