Well hoot I must have got the silver. CDU finished $1.57 last week at 4.00pm, after being higher.
At the auction it was $1.58 when a trading halt on CDU occurred and trading for the day ceased.
At $1.57 I was in Margin Call, at $1.58 I was in Buffer.
I had to pay up and it cost me 550 CDU.
cheers,
Max