Prior to my show last night, I mapped the faders on my 62 to ME. Worked perfectly. However, when I arrived at the show, not only did they faders not work in ME, when I attempted to remap them it would no longer work in ME. Naturally I was was in the middle of a show, so I couldn't just shut it down. This was just one of a couple of issues I had during my show last night. Any idea what my mapping problem could have been?