Well, I was able to squeeze some darkroom time into the schedule tonight... and I'm happy to report that you folks were right - it was my ilfosol s giving up the ghost. I developed a neg in fairly fresh d76 (that had been tightly capped) and it came out fine. I'll be darned... I can't believe how barely loose that cap was on the bottle of ilfosol s... it obviously doesn't take much to ruin it. I'm now anxious to try some of these other devs out that you all have recommended.
I can't thank all of you enough for your time in helping me out here. You've saved my sanity.