Dongle stops working after DCSS agent installed

Hi Everyone,

a colleague installed DCSS agent (6.0) on a machine with IPS enabled.  After reboot, the machine had a null-policy.  With the null-policy enabled, my colleague reported that a dongle plugged into a parallel porton the machine stopped working.  Should the agent be conflicting with a device with a null-policy or with prevention disabled?  I checked Monitor and found nothing of interest.  I am looking for suggestions for troubleshooting.

Thanks Bob