Try running
cscript //H:WScript
and then run your code again.
What this will do is set the default script engine to WScript, which will show a message box if an error occurs.
Perhaps what is currently happening is that the default engine is CScript, so when you run a script, it flashes up in a DOS prompt, then disappears.
Have you also tried running the script directly from a command prompt with
cscript.exe c:\temp\myscript.vbs
That should keep the prompt open for you to see any errors.
Otherwise, in the code itself, you might have On Error Resume Next in there, which won't show any error messages at all.
Regards,
Rob.
