Users upgrading to Photoshop Elements 6 from a previous version should most definitely read the ReadMe file included in the installation directory. There is important information here about converting catalogs and creation compatibility. I also recommend you check out some of the Photoshop Elements support TechNotes on Adobe.com.
- Label and view hidden photos in the Organizer (Photoshop Elements 6)
- Common catalog issues when you upgrade to Photoshop Elements 6.0
- New behavior in the Organizer when you fix photos in a Version Set (Photoshop Elements 6)
- Copied catalogs are not displayed in the Convert Catalog dialog box in Photoshop Elements 6