Hi all, basically i have an iPhone which is only ever connected to one mac. All the applications/music i have bought are stored within the itunes library on this mac. This morning when i tried to sync my iphone i got the following error 'This computer is no longer authorized for applications that are installed on the iPhone, "iPhone 3G". Would you like to authorize this computer for items purchased fron the iTunes Store?' If i click authorize - it asks for my password and then says 'There was an error storing your authorization on this computer' I have not changed anything and all the music i bought on iTunes i can still play. Yesterday i emptied my 'Trash' as it was over 50GB and this is the first time im syncing since. I guess i could have delete a folder or something ages ago accidentally. Can anyone help? eg how do i rebuild iTunes without losing all my music and applications. I know i can backup my music on to Timemachine or just burn a cd. but what about applications? Any help would be much appreciated! Thanks in advance!