Hi,
if nothing shows up in profiler when you have a black screen, then it might be your UI that shows a black screen ( or nothing), and you have a tempo somewhere...
Make sure you document yourself on how to use the profiler, thee profiler doesn't require any coding, so try to understand how it works, what to look for, what to enable ( memory, script, renderingm, physics, audio, etc)
can you put debug logs before and after you load the scene, make a simple fsm in your scene that says hello when it starts, then you'll know if the black screen is coming from scene loading or UI.
Let me again reassure you that not everyone has black screens when using playmaker or doing mobile dev, something is odd here, we need to find it. If you have other devs saying so, can you redirect them to me so we can also address that and find out exactly what's happening?
Bye,
Jean