This has me confused

A user in the company is trying to convert a .mpp (MS Project Standard 2002) file to .pdf. It starts off fine, she gets the converting progress box, but then instead of converting, it prints out to the LAN printer.
Actually I have no idea about this. Googling this hasnt yielded much. I have reinstalled the PDF printer, and this is happening only for her, no one else. Any pointers anyone? We use XP SP2 on the clients. This has only started happening now.