Hi I am having the problem of print jobs disappearing as well. I am having the problem on both an xp machine and os x machine with a designjet 500ps with the hpgl2 card. The problem on both machines is very bad when I try to use large custom size pages. I can print from other software from the same machine to the plotter but VW won't work the print jobs just disappear. If I use smaller sheet sizes B & C then I can get it to print sometimes from VW. I was told that since I was using VW 9.5.3 it was a problem so I have now upgraded to VW 11 and it still won't work. I am able to print to pdf and then from acrobat print the files to the plotter. Any suggestions?