[User 55003]

The add-on author provided a boolean condition for things like this, so why not use that?

Detect Running Status
This property returns a value of True if CinemaVision is running.

Code:

!IsEmpty(Window(Home).Property(script.cinemavision.running))

Just add <visible>IsEmpty(Window(Home).Property(script.cinemavision.running))</visible> to the DialogBusy.xml

Works for me.