I can't project my ipad with activcast but I can with my iphone.
I am also experiencing this issue with not being able to mirror either thru AirPlay or using the ActivCast Sender app on iPads. All we get is a black screen after you tap on Allow. The ipad is running on current ios operating system 12.0.1 and panel to v18.104.22.168. They are connected to the same network. It work fine when I use my iphone but the ipad is just a black screen.