Hi Ed,
You do need to update the WIU to version 1.1 firmware. You should also check the firmware in the TIU. Like with the WIU, just because it's new in the box doesn't mean it wasn't sitting in the box for a long time. You can use the DCS remote to check that the TIU is running v6.1. If not, you'll need to upgrade it as well. However, the fact that you were able to load an engine into the phone at all is a good indication that the TIU's firmware is at least v6.0.
I agree that changing the WiFi channel is a good option. If you or someone else on site has an Android phone, you can install a WiFi analyzer app and see which channels are already in use. (such app are not available for iOS).
Another thing worth checking is the serial link between the WIU and TIU. Just because the WIU is able to hand shake with the TIU, which causes the WIU's purple light to turn on, doesn't necessarily mean the connection is stable. A good test is to try a different USB cable. If there's no change, remove the USB cable and use a USB/serial adapter instead. If the communication becomes more reliable, the USB chip in the TIU maybe damaged.
