Airsquirell's Reflector seemed to break in beta 4. When mirroring the ipad to the mac it just gives a black screen.
It was fine in betas 1-3.
I downgraded to beta 3.
Hope it is fixed in beta 5.
My solution worked. But it was only ever going to be a temporary solution. Downgrade to beta 3 to get Reflector working again. I don't know of any workarounds in beta 4.
BUT ... this is unsustainable. I can't stay on beta 3 forever. So I tolerated 1 day more on beta 3 but I'm ready to move on now.
Exploring other apps, I found that LetsView - which does a similar thing to Reflector - DOES work in beta 4.
So I installed beta 4 again and got LetsView working.
I really think this is not something that apple has to solve. So although I said before that I hoped beta 5 would solve it - which would be nice, it's really for Airsquirrels to solve, not apple. Especially since other similar apps still work in beta 4.
I contacted Airsquirrels about it so maybe they will do something about it.
But for now I'm back on beta 4 and will be exploring other apps, rather than downgrading an entire operating system merely to get 1 app to work again.