iTunes MobileDevice library not found error when 'Install application on the connected iOS....'

After recently upgrading iTunes to 11.0.5.5 I get the following error...

'iTunes MobileDevice library not found. Please check your iTunes installation'

..when selecting 'Install application on the connected iOS device' from the 'Post Publishing' section under the 'Deployment' tab in the 'AIR for iOS settings' dialog box

This used to work? Any ideas?

For now, I can manually use iTunes to add the file to the device, but this does slow down work flow considerably.

Thanks,

Alan.