I have an intermittent problem in that occasionally I am unable to print from my xp computer. The problem is resolved by rebooting and then printing is fine. The problem occurs on both my Brother laser and Canon Pixma inkjet. The Brother is connected to port BRMFC and the Canon to USB001. The Brother has a parallel connection and I was advised to use the BRMFC port rather than LPT1 as it kept throwing out a test page before every print run - that problem has been resolved. Any help would be much appreciated.