Shadows and BLOBS (LPV artifact?)

What causes the dreaded ‘circle of death’, shadow light sometimes, follows character on most areas of my world comp project, and prob. other projects. It just ruins realism , but YA this does too! Do we know what causes this anyway its the first image, and the problematic shadow looks like a spike of sorts. Remolving Sun & Sky gets rid of it, not an option, as with it goes realism, totally flat world.

Secondly, are these dark colored squares etc., that I see on load of project, never seen this before ODD, as I move mouse to view scene areas, it goes away , is this a LPV bug, or ???