Blue Iris

Hello everyone.

I've just installed blue iris 5 over 4. (3 cams)

Tinkered around with a few settings but now when maximizing the cams they disappear and I'm left with a Black ( empty) screen.

Any ideas from anyone would be appreciated.

I have the same issue. I have to restart BI every time.
It used to work fine. And I just updated too and it's still broken. Would love a fix for this