I get a similar issue where my printer wont print after
printing and then switching users on the same WS.
It prints fine 1 time. then it will look like the job is
hanging in queue, and my system resources show "system"
using 90-99% and I have to coldboot the pc to get it to
print again. It appears to have something to do with
multiple users (actually only 2) on one same workstation.
MS said it was my old printer was not on the list of its
approved. I went out and bought a new one and tried the
drivers that came with it, fromt he Manufacturer website,
and what windows comes with. Same results. It will print
fine until I switch users. Then i have to reboot if I
want to print again.