Hey i have been doing several tests and I think I've found the issue. It's something relationated with the distance. In the pictures that I sshow you here, its exactly the same scene, only i changed the distance of the emissor to the wall. The square it's only a reference to compare, that it's 20cm x 20cm. When i come back the emisor next de wall it works again...
So if some distance is working for you, when you move the emissor far of your original distance, it will stop working... (i'm clicking refresh simulation for every step i've done)
So if some distance is working for you, when you move the emissor far of your original distance, it will stop working... (i'm clicking refresh simulation for every step i've done)