Sync problem

Hi all,

My contacts don't seem to be syncing properly via MobileMe:

I noticed yesterday that a picture I had assigned to a contact on my iPhone had disappeared so I took a new picture and assigned it to that contact. When I went into Address Book on my Mac there were two records for this contact, one of them containing the old photo and the other containing the new photo. There remains only one instance of this contact (with the new photo) on my iPhone.

I added a picture to another contact in address book and this has appeared in my address book on me.com, however this has not yet appeared on my iPhone.

Help!