In afterhours trading, I noticed that something changed on Monday, April 17th with respect to either INET orders or IB direct to INET orders. If anyone has any ideas, I would like to hear them. Here is an example scenario - the actual numbers may not be correct (can't quite remember the specifics): This morning in pre-market, HAL was bid at 83.65 on ARCA due to a Cramer pump from the previous evening. This bid was hit by someone (selling or shorting). Next, a bid on ARCA appeared at 83.64. I wanted to short this 83.64 bid. I entered my order, but because of ARCA's idiotic pre-market uptick rule, my order was repriced to 83.65. Because I wanted to get short HAL at 83.64, I decided to instead send my order to INET thinking that maybe someone would hit my offer there or maybe the ARCA bidder would switch his ECN to hit me on INET. Anyway, I sent an 83.64 short order into INET and according to IB, the order was active (i.e., the status bar was green). However, I could not see the order at all. It didn't show up on IB's quotes, it didn't show up on RealTick's quotes, and it didn't show up on INET's publicly viewable limit book on its website. It is as if the order did not exist, but IB was showing that it was active. When I switched my limit price on the INET order to 83.65, the order appeared on all of the quote sources just fine. It was as if INET was aware of ARCA's uptick rules and was not showing my order if it violated ARCA's uptick policy. Bizarre. This INET order behavior started occurring on Monday, April 17th. Before April 17th, the order would have shown up on INET as a limit order to sell at 83.64. I would have seen it on all my quote sources (IB, RealTick, and INET's web limit book). So my question is, did something change at INET that anybody knows about? Or is this an error with IB's routing? If I can't see the order, how do I know it exists? Who is at "fault" here? INET or IB? Any help would be greatly appreciated.