Print job leaves queue but document isn't printed

I had a similar issue just last week, labels being printed just vanished form the print list, and then nothing, printer itself is working, calibrated etc.

And i found out that, i had 2 configured ports for one Label printer (I re-craetedthe view, with some mspaint magic :P) This issue was on more than 5 desktops, so something to do with a Win7 Enteprise x64 image that we use ... but... onwards

Solution : if you see this issue, delete the local port (how?), by changing the printers default port to LPT1-3, click Apply, then choose USB00* Local Port ( click once ), and then press DELETE should remove the secondary un-needed port.

Press Apply again, just to be safe, Reboot PC, check again, if the problems does not persist, and try printing :)