Yesterday, I sent out an TechSplanations alert blast regarding a very serious issue with QuickBooks 2006 for Mac whereby the auto-update functionality of the application can delete the contents of your Desktop folder.
Thankfully, I have not heard from any of my San Diego clients who have encountered this problem. However, the very best information regarding what has happened and what you can do to protect yourself from data loss, is contained in a few knowledge base articles from Intuit: