Yes, I've developed a blank roll. And, if it makes you feel any better, yesterday i decided, despite being really tired, to develop three rolls of 35mm that I had ready. I had pre-soaked them and the thought, "I wonder if my fixer is still good?", drifted through my sleepy brain. I decided to see if the negatives had cleared and opened the tank to check... before developing, stopping, fixing. The top roll was toast, the middle roll suffered lots of light leaks and we shall see about the bottom roll, though I'm not too hopeful. Don't dev when tired kids!