I would make everything invisible in hierachy editor.. Then switch on groundplane and one critter..  better yet,,, one primitive and save the ground texture to materialroom. Then just disconnect the texture..

Now you have a "box" over your groundplane...no textures..I'n sure you got it from here. This should tell you what is or is not happenning..

From there,, switch to a spot and use "point at"  function. Then switch to shadow cam and tune the light while looking through the cam. Maybe infinite will work after all..Just switch off "point" before you switch back or the light will travel...

Shadowpasses tests should be fast and furious till you solve the problem

..reconnect textures,, toggle "universe" in hierachy,, away you go