Script doesn't run on one system

[mmo]

I recently wrote me a VBscript that traverses the project (or rather a packege and all its sub-packages) and creates .emf files from all contained diagrams. We embed these .emf files into our documentation.

Now, I just transferred that EA project (i.e. the .eap file) from one system to another and, strangely, on this 2nd system that script doesn't run! It doesn't even reach the very first line, which a Session.Output("...") statement telling what this script is doing. There is also no error message nor alert box, no message on the console nor in the "System Output" window - nothing! So, something must be badly wrong with the VBScript setup in EA here.  

On the original system that very same script runs just fine!  :-/

On both systems I have EA 10 (Corp. Edition) running (one is a Windows 7 box, the other a Win 8.1 box, but I doubt that THAT is the reason).

What could cause a VBscript in EA to run on one system, but not even start on the other? Any idea or hint?

M.