You're right, it seems to be almost a conspiracy sometimes. Usually when activity picks up and you need to act, ARCA goes down and you have no choice but to send your order to the nice 'ol boyz at amex!
ARCA definitely gets my vote for WORST EXCHANGE EVER. While they have morons braying on TV about speed and liquidity trading the QQQs on ARCA, two of my SMART orders have had the misfortune of being routed to ARCA, where they have been pending cancel for about an hour now.
Actually, since ARCA doesn't seem to be a temporary problem: def, do you think it would be possible for IB to implement a "SMART_WITHOUT_ARCA" routing option?