The printer is an HP OfficeJet Pro L7580.
Good day Todd,
Typically when you see intermittant printing problems, the issue lies with the files, not with Reader. That said, be sure to update to Reader 10.0.2. Also, check the PDF Producer of the files your user is trying to print. This can be found by opening File > Properties. If the file was not made using Adobe software, it may not print properly from Adobe Reader.
Adobe Technical Response Team