So, I've had the same issue after the past two updates (with my HX Stomp). For some reason, when I switch to a patch, it was as if the guitar signal was not making it into the Stomp. I then went into the Input block (first block in the chain) to verify it said "Input Main L/R" (which it did), changed it to something else, and then changed it right back to "Input Main L/R", and then it starts working fine. However, if I don't immediately save that preset...and move to another preset, and back to the original...it has the same issue. Once I figured this out, I had to go through each/every patch and just change/reset the input block and then SAVE the patch...and then they work fine from that point on. Weird but it seemed to resolve it for me.