Since a few days (from before iOS4) I get a pop up when I sync my iPhone. 'Can't synchronize the iPhone 'iPhone 3GS from René van den Abeelen'. The filename already exists' is how I translate it. Filename? What filename? It seems the synchronisation is continuing but nothing more happens so at last I click OK and I can disconnect. On the Mac iCal-data are not synchronised, on the phone a new ringtone is missing and perhaps there are more items that are not synchronised. I haven't got a clue what the problem is. Can anyone offer advice? Thanks very much!!!