SOLUTION: Planar Pads can touch, but not overlap.  While the DTM will appear correctly in 3D, the Section Viewport becomes corrupted.  I will archive a repaired file.  Can someone at VW please let me know who to send the files to, so you have a documented bug + solution for you to reproduce and fix.  You have my Service Select info if you want to send me $ for a finders fee.   UPDATE: submitted bug report and uploaded files.
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