We’ve had a couple reports of users saving as PDF from Visio using the Microsoft Save As PDF/XPS add-in that now ships with Office 2007 SP2. What happens is when you try to save a Visio drawing as PDF you receive an error message:
"This file is open in another instance of Visio or in another program" 1400035
It only seems to happen when saving the PDF to a directory different than the directory the Visio drawing is stored in.
We’ve only seen this with Kaspersky anti-virus. The only workaround I’ve heard works is to add an exception in Kaspersky for the Visio application (VISIO.EXE).
This most recent report was with Visio 2007 on Windows XP.