On an almost-daily basis, we have problems with market data from ArcaEx at Interactive Brokers. Most of the time, this is a period of time when data for a given alphabetic range of, or all, symbols are not available. Less frequently, but still at least a few times a month, ArcaEx quotes are stale across the board, crossing other ECNs, particularly after hours. Almost without exception, IB says the problem is ARCA's fault. I've got a letter prepared to send ARCA, the SEC, and the related SROs, talking about various problems that include those mentioned above. What I want to know from other traders with other brokers is "are you experiencing these same quote problems with ARCA, and with the same frequency"? P.S. I'm also addressing the other policies that cause them to routinely fail to execute orders that are marketable against their own book because of their marketplace confusion.