Unable to sync my iphone with itunes over wi-fi

This might be me be being extremely dumb, but I am unable to sync my iphone with itunes over wi-fi. I have itunes 10.5 on windows, have iOS 5. When I plug my phone into my computer I have ticked the box on the device summary screen enabling wi-fi sync but when I go into my iPhone menu, the "sync now" box is greyed out and it just says that it will resume sync when my computer is available.
Any suggestions>??

Sign me up for a "me too"
updated 1 iPad,1 iPod and 2 iPhone4s and sync works on all but my iPhone4
Each iP* device has it's own Windows 7 system to sync with
When I unplug the iPad, iPod or other iPhone, the device stays in the devices list in iTunes
When I unplug my iPhone, it disappears from the devices list (which makes me think it's iTunes being petulant)
Have tried rebooting bot windows and the iPhone, disabling the firewall and 'repairing' iTunes
It's a 64 bit windows 7, FWIW, but the other iPhone 4 talks nice to a 64 bit windows 7

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