itunes sync problem with iPhone and ipad

hi all,
hard forum post in, went general.

last few months, every time sync iphone (and "new ipad"), not backup apps bought on advices, saying computer not authorized (and gives me directions on how that).

needless have done that, , says silly you, computer authorized (4 of 5).

do? @ first didn't care much, getting number of apps.

 

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