Received wisdom is that Rodinal and its relatives (R09, APH09 etc) is virtually immortal. But after being away for a few months, I have returned, and I've run three films though using developer from my trusty about-a-year-old bottle of APH09 (I have an unopened spare, never fear...) which is stored in a dark cupboard at room temperature, and all three films came out almost completely clear! Whiskey Tango Foxtrot? At first I thought it was contamination from fixer residue in the tank, but I gave the tanks a thorough scrubbing, so that ought to be eliminated. Then I thought it was the water, but I've been checking the ph, and it's normal. Also, I've used a different developer (Moersch Finol), which is just as dilute (1+1+100), and it's come out just fine. So it's not the water. It's not the fixer either: fresh batch from powder, and it's worked fine with the Finol-processed film. So, what's happening here? Any theories?