this started a few days back. we'd been using print center just fine for a number of users, when suddenly every pdf/docx/etc. that was uploaded would process (say "uploading - 100% done) and finish with "one or more errors occurred." next to the title. nothing except the printing time elapsed shows on the print center page. in the alerts it's the old "unable to print zero length print job".
running print center 1.7, pharos 9, server 2008R2.