I have *exactly* the same problem, at least I think.
I can send a contact from my address book via BT, but pictures just come up with a 'Can't send' error. I can't say exactly what it is 'cos it is in Chinese (I am in China, and the 6600 for some &^%$£$ reason doesn't come with English menus. Good idea Nokia.)
This causes me problems, 'cos I can't get PC Suite to work properly either. Whenever I fire it up it asks for a phone name, but WHATEVER I put in it comes back and says it is an invalid name. Anyone have any ideas? I am going mad.