My printer is a LexMark x5270. I just downloaded the latest drivers for it (I thought the same thing).
As far as I know I'm using the latest updates for the files (CardVault 1.5a and the April 10 L5R files).
I have tried to print proxies for several decks ranging from just a single card (Togashi Satsu exp which I have successfully printed a proxy for in the past, maybe a year ago) to an entire deck (Mostly Wrath of the Empire and later cards, but some older ones from Diamond). ALL of these decks failed to print. I then tried downloading the MAgic the Gathering files to see if I could print prioxies for those and I got the same issue.
Thanks for the fast reply.