There's an update on this.

KSL's engineers discovered a tarantula sized bug in IBOC that caused
the seven-second delay. They were able to fix some things, and soon
the bell sound reappeared about four days after the first reports of
this surfaced.

BTW: Clear Channel fired up IBOC on KJMY 99.5 Bountiful/Salt Lake this
week (the first FM in the market to do so), and probably the next day
fired up the IBOC equipment at KODJ 94.1 Salt Lake.