Hey,
I was testing the new light solver and I found some artifacts in my simple test scene.
In attached file "test New Light Solver.jpg" in the bottom right corner of the image you can see some strange artifacts around the light on the floor, but while rendering the same scene with old light solver everything is correct - see attached "test Old Lighe Solver.jpg".
Corona version: 3 (Daily Build Aug 9 2018).
Light: CoronaSun (intensity 0,3, size 4) and Corona Sky.
+ portals in the windows.