So, made a scene with Max 2021 and Corona 7 hotfix1, everything looks fine, but out of the blue, materials were changed in rendering (and were normal at the viewport), whenever I isolated an object, the material changed, if I rendered more objects, the they changed again, and at one point the HDRI got all blurry and weird.
Some prints attached (I did not changed anything a part from unhiding and hiding objects, happened to anyone? Also sometimes a block renders completly white.