PPT error

[Plymouth]

I've just installed WorldViz v2.51c and PPT v2.1 and I can't seem to get Vizard to find the PPT data. I have both programs running, the Talk button has been hit, and I'm using the art gallery demo world to test. The error I get is:
vizppt.dls WorldViz PPT v1.1
Failed to connect to COM2
Failed to connect to COM3
Failed to connect to COM4
** ERROR: Failed to connect to PPT

PPT should be using COM1. What can I do to fix this?