This has been happening consistently since updating my Helix LT to 3.71:
If one preset is left on for a prolonged period, block 4 in path B will become inactive - doesn't work if bypassed or "on", and toggling between bypass and "on" makes no difference. Sound still passes through, and all blocks after it still work as expected. Changing to another preset and then back, or turning Helix off and back on eliminate the problem. First noticed this when my Helix was left on in the studio overnight and the preset had no delay when I began recording the next day. I have accidentally done this many times in the past, but the issue only began after updating to 3.71.
This is obviously not an unworkable situation, but it recently happened during a rehearsal when I had been using the same preset for around an hour, then we took a break to eat. Came back and the delay wouldn't work.
I use a template for all my presets where before-amp pedals and amp blocks are on path A, time-based effects and cab are on path B. The fourth block on path B is where I will always have a delay (this issue happens no matter which delay it is).
Not knowing how individual "blocks" relate to individual DSP processors, I'd just like to know if this is a sign of an impending DSP failure. It seems a lot like a memory leak in desktop world.
Has anyone else experienced this?