I've been using HC110 with dilution H for awhile with no problems. The last roll of Tmax 100 in 120 was a total failure. I went through the developing process and when the time was up I poured it out and it looked like ink. I thought to myself " that looks like the emulsion just washed out". I kept going through the process of "stop,fix etc." just incase things were still ok; but in the end, my film was clear. The emulsion was completely cleaned off. I noticed that when I poured it in my tank it looked amber colored instead of clear. Does HC-110 change with time? I mixed it one month ago. I processed a roll of 35mm three days earlier with no problems. I just dumped what I had left and mixed a new batch but haven't tried it yet.
Mike