I have combed the net to try to find an answer to my daughter's avatar shows up in my latitude "friends" interface, but my wife's does not. I have tried clearing the cache, removing my wife and re-adding her to my friends but her picture never shows up. Her picture is on both my Droid and Gmail contacts.
Prior searches persist in latitude with no way to clear them (Google left the clear data off of maps version 3.3.1). Clearing the cache does not clear the previous searches from latitude. To clear the previous searches you must uninstall and then reinstall maps.