I was having this problem as well while trying to use the print Document object in VB.net. No matter what I tried I was never able to get the labels to print. I found this article which worked BEAUTIFULLY!
http://blogs.lessthandot.com/index.p...er-from-vb-net

The search words to use to get this article incase you cant get to the whole thing is printing to a zebra printer &...