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The Biosemi FAQ lists the following pin assignments:

Presentation Parallel : Gnd(25) 1 2 3 4 5 6 7 8
Biosemi : Gnd(37) 2 3 4 5 6 7 8 9

These are the pin assignments that the cable makes (as checked by multimeter).

However, Connecting Pin 1 to Pin 37 on the USB interface causes trigger one to ...

I have checked the cable with a multimeter and its integrity has been verified.

We tested the trigger input of the USB receiver as directed. This worked.

Any ideas as to what is wrong with Presentation?

We are using the latest version of Actiview with Presentation software to run the experimental protocol and send stimulus/response codes to Actiview.

Actiview does not receive the least significant bit of the event codes from Presentation. (i.e. all odd numbered event codes).

Any ideas?