I have lost the whole ability to Label (colour label the file with red: cmd-6 for example) or add a rating (Add a number of stars to a file eg with the number cmd-5 for a '5-star' image). When I press these keys it doesn't change in my thumbnail (content frame) or change in my filter frame.
I've never had this problem before and my Bridge is up to date
See if this option is checked or unchecked in Bridge's Preferences. If you WANT to use the Command key, than be sure it's checked. If you just want to press a number without the Command key, than have it unchecked.