See if you have a prode.dll file in Mathcad Prime 3.0/Custom Functions folder. If there is one there, when you start Prime 3, it will try to load ppp.dll. If there is no prode.dll, then the error message must be referring to another ppp.dll that is unknown to me.
The prode.dll was created by PTC and me to provide the link needed to the Prode Physical Properties program. It shouldn't be on your computer unless someone tried to install the Prode program and it is installed improperly. You can learn more about it at my website, http://www.harveyhensley.com/mathcad-link-to-prode-physical-properties.html
