I edited my original post and made some clarifications, you may want to re-read it.  Clouds rolled in so I'm shut down now and won't be able to test as you asked.  I'm not convinced the terrain is causing the problem, but for sure, something in 3.5.3 is.  When I reverted back to 3.5.2 the problem was completely gone and my rig worked again, 100% perfectly.  Could the new terrain cause this?  I don' t know, but something in 3.5.3 is amiss.

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