Can't trust this computer for iphone and ipad with Itunes

hi all
after updating to ios 7.1.1 on both my iphone 4s and ipad I keep getting this message when I connect my phone or ipad to my iMac
:iTunes could not connect to this iPad. You do not have permission.
then this : Do you want to allow this computer to access information on “davidbarton’s iPad”?
If you don’t allow access, you will not be able to manage or sync your iPad with this computer.
I click trust on the device and then continue from within iTunes and I get this : iTunes could not connect to this iPad. You do not have permission.
I have started getting this too after running disk utility and verify disk permissions, then running repair disk permissions
: The iTunes Library file cannot be saved. An unknown error occurred (-54).
*** is going on please and how can i fix it, anyone?
thanks

Yes.
Anything you uncheck in iTunes remains the same with iTunes regardless which device you are syncing.
I make use of iTunes playlists for the music I want transferred to my iPhone. Under the Music tab for my iPhone sync preferences, I have selected playlists, artists, and genres chosen. I select the iTunes playlists and/or artists and genres that I want transferred to my iPhone. I also have sync only checked songs and videos selected under the Summary tab for my iPhone sync preferences. This way if I want to remove a song or songs from my iPhone without removing the songs from the playlist I've selected to be transferred to my iPhone, I can uncheck the song or songs in the playlist in iTunes followed by a sync. Or I can remove a song or songs from the playlist in iTunes followed by a sync. To add additional music to my iPhone, I can add the music to one of the playlists in iTunes I've selected to be transferred to my iPhone followed by a sync.
You can have the same playlist or playlists transferred to both, or different playlists transferred to each, but whatever is deselected in iTunes will be reflected on both with sync only checked songs and video selected for your iPhone and iPad sync preferences.

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