I trade with a demo account with IB right now. Every time I try to buy a SSF for a stock, like 7 times out of 10, I get "Could not value the contract at this time". Why is that so? I see the bid-ask prices, and I see the bid-ask sizes, why doesnt it work every time? Does it happen to anyone else, or maybe this happens only in demo accounts? thx
Should be just the demo account - try the paper trader. It might be possible that you were testing this outside of US trading hours and thus the contracts were closed.