HP G95 Printer freezes with Calender and Tasks

I am having an issue with printing certain styles from
Calender (daily and tri-fold) and all styles from tasks.
The print jobs show up in the printer window and indicate
that they are printing. However, they do not print and
they keep all subsequant jobs from printing. I have to
cancel the calender or task file that is trying to print
and then reboot the machine in order to free up the
printer again.

The printer I am using is a netwarked HP G95 with a
Jetdirect 170x print server. Any suggestions?