Hi Mr. Corvette
I always turn on the iPad first, then the router, and make sure the iPad is connected to the correct router, then turn on the 1608 mixer.
Look in the WiFi settings on the iPad and see if there is a check mark to the left of the router that you have connected to the Mackie 1608 via the ethernet cable, and make sure it is not a crossover Cat 5/6 cable.
Sometimes, at least to me,,, it seems like the 1608 can't find the router so I turn off the 1608 for a few seconds then back on.
Forgive me for asking the obvious, but when you click on the little settings "gear" icon there should be four options,
Offline:
Work Offline/Demo DL1608
Work Offline/Demo DL806
Wired:
No Connected Device
Wireless:
DL1608
Tap the bottom "Wireless" choice and it should become blue
Let me know if that does it.
Dan