I used to be able to access my iPhone directly from Windows Explorer under Windows 7, can't now. iTunes can see the phone, Windows 7 Explorer can't.
Is there any known fix?
Check device manager to see if the iphone is listed, or if you have anything with a question or exclamation mark.
Edit- also check disk management (just type diskmgmt.msc on start menu and press enter, or into windows + R run box and press enter) to see if the drive is possibly detected without a letter assigned.