After therapy with a roll of 120 film and a continuing prescription of Manic Expression, I successfully exposed and processed six sheets of the 40-year-old 4x5 Plus-X rescued from the transition to digital in my department early in the millenium. I had been leading the transition to digital graphics on the whole campus for some time, so I can't be too critical.
My first ventures with the big old film revealed I was being too trusting of my changing bag and even unfogged negatives, when developed, had odd marks which I attributed to the film resting against the hanger during stand development. A few weeks ago, I again confidently set forth with the Pinhole Lab Camera and the changing bag, making sure to swap the film in as deep a shadow as I could. I even had a black jacket on. Alas, it looks like reloading this big camera just takes too much wiggling and it seems the teensy amount of light it takes to fog film snuck in through the sleeves.
I exposed another six sheets, this time loaded entirely in the darkroom, all with the camera set up for the 60mm film plane with .28mm pinholes. Some of those previous sheets which had been semi-stand developed looked like they were unevenly developed as well, so I did normal agitation with Rodinal 1:50, this time with a Paterson MOD54 4 x 5" Sheet Film Holder.
There doesn't seem to be any exposure-fogging or serious base-fogging in the vintage Plus-X and no issues with uneven development. The Paterson System is much less trouble than hangers and tanks and uses much less developer. It's a little tricky to load compared to hangers, but you can't beat daylight processing.
I'd been watching the dappled sunlight on the hostas just outside the lanai for days before I got up my courage to make an exposure.