We are a NW6.5 SP8 site running a mixed NDPS and Iprint environment. We are using Pcounter and Pcounter Pro to track printing.
We have found this summer that devices using Pcounter Pro terminals are releasing the job twice.
The only thing I have found is that this happens on IPrint configured PCounter Pro devices, not NDPS configured Pcounter Pro Devices and not on straight Pcounter Print devices.
It also does not happen for all jobs, but frequently.