Quote from Steve_IB:
Just to clarify, this is the IB policy from the website:
"
...For long positions not settled in cash, customer agrees to roll forward or close-out the position by offset three (3) business days prior to the exchange-specified first notice day (the long "Close-Out Deadline").
"
The first notice day is the first day that a buyer of a futures contract can be called on by the clearinghouse to take delivery. Hence, we restrict customers from opening new long contracts during this period.