Nope - what did your broker say? Sounds like the order was lost - what product/exchange? Forget ADV - what was the volume that day?
UPDATE: Apparently when you enter a trailing stop at Schwab on the weekend, the trigger price isn't Friday's close, but Monday's open. I asked this question at Fidelity and they say it's Friday, ditto with IB, and those trailing stops executed as they should have. The bozo I talked to at Schwab was flabbergasted that Fidelity and IB would do that. Convince me I'm wrong.