Same problem here (since corona 7). I do use Pulze Manager too, but only for a day now.
But with this bug still existing, batch rendering is quite useless ;-)
I have to say, that the problem doesnt always occur.
Problem description:
Starting a rendering
Corona VFB shows up, stays black...
Scene Parsin forever
I have to activate/click on the VFB window once, than rendering starts immediately
Very annoying
I use latest max 2022 and corona 8 hotfix 2
most of the day i have multiple instances of 3ds max active...