I had a similar problem this morning - at about 9AM. C1 area was jammed and the elite line was closed. All I could get out of the maroon coats were "one line, one line" - they couldn't or wouldn't say why. They didn't know if the other checkpoints had elite lines open. On walking to C2 I encountered a CO person and he said TSA had reduced staffing after 8:30 AM and that is why there was only one line. I guess TSA doesn't staff for Sat departures.
In any event C2 was empty - both elite and regular. Have no idea why a sign couldn't be posted (or the maroon coats tell people) that elite access was available in C2. I guess it would also be too much to give them some walkie talkies so they can direct people to other areas, too.
CO has to realize that when one of the major benefits of thier elite program isn't available, they are the ones that look bad. They have to support the program.