Solved
ptc-2648087Answer
1-Visitor
January 17, 2020
Created a ticket, no help. One of our techs found making a .bat file and running the Mathcad executable via the following command, works around the issue.
start "" "C:\Program Files (x86)\Mathcad\Mathcad 15\mathcad.exe" && exit
Mathcad Prime versions execute normally.

