On my Template (which is all default settings), Color Class is in a section on the bottom left called Image Preferences. If you don't see this on your Metadata Template, please load the snapshot of the Metadata Template that is causing the problem, and then click the 'Save' button at the bottom of the metadata window and save out an XMP file of your template and send it to us. If you'd prefer not top post the file publicly, send it to support@camerabits.com