Quote Originally Posted by Zack Barresse
What is failing exactly? I'm assuming this is a VBS file of sorts?
What is failing: can receive an unknown COM error in previous scripts (compiled Winbatch or Powershell) that automate Excel. Occurs when Powerpivot and Data Mining add-ins are installed and active which takes Excel more time to fully load.

Again, not a Powerpivot issue but more a timing issue starting Excel and setting properties. Issue was resolved by use of the .ready property, so the post was more an FYI.