John --
When I fly, I have 3 devices running iFlyGPS.... a 740b, an iPad Mini 4, and my Android smartphone. The smartphone is set to cellular so it's not picking up ADS-B. But both the 740b and the iPad are set to the ADS-B network and display targets. In this case, it was the 740b that showed the "diamond" target. In my previous "diamond" target experience, I think it was the iPad. What that says -- that it will happen with one device but not another, on the same network at the same time -- I don't really know. (The programmer in me knows there are way too many variables to take into account just by deduction, which is why they need the log!) Given the weather, it will be Friday soonest that I will fly... but I have all my devices set up to record the ADS-B log!
-- Robert