oh, i knew i'd seen this post somewhere before. saves me starting my own.
ready? here goes...
i have had the same problem!! i've just done 5 cases without getting any favours. i mean, i've just solved 5 non-favour cases, and haven't travelled. still no favour.
ok, from reading the replies above i guess that no-one knows the answer but i wanted to jump up and down about it since i'm trying to get a contact.