First of all, I'm new to the forum so please forgive me any mistakes (also in my english).
Setup: I'm currently rendering a Smoke simulation in Cycles, for which I've also setup a ground and wall plane as a collision object, and more importantly, a shadow catcher.
The smoke domain material is the default setup created by the "Quick Smoke" effect.
The issue: When rendering the image, theres a grayish Box at the intersecting point between the ground plane and the smoke domain (which is set to adaptive, the box lines up with the edge of the adaptive domain).
What I've tried so far:
moving the ground plane
changing the light in the scene
Disabling "Shadow" Ray Visibility in the Cycles Settings of both the domain and the ground plane
It looks like I'm not the first one to experience this problem, but I've not discovered an answer that worked for me yet.
Any help is highly appreciated.