After synching iPhone, most of my apps no longer work.   how do I fix this

I've had my 3GS for several months, and purchased several dozen apps over that time. I had never synched the phone to my mac until today, though (I didn't have a new enough OS or iTunes). Now the phone synchs and backs up (it says) but I got a message saying some of my apps couldn't be synched because this computer isn't authorized" and I should authorize the computer. I click on the "store" tab and do that, and get a message saying "this computer is already authorized".
When I click on any app that didn't come with the iPhone, it flashes on for half a second and then closes.
How do I get my apps back and functioning? Please advise, thank you.

Now when I plug the iphone into the computer, itunes and iphoto don't respond (it used to be that both programs would launch if they weren't already open when I plugged the iPhone in, and when I plugged it in while iTunes was open it would show in the left hand column).
The system profiler confirms that the computer sees the iphone in the USB bus, and when I plug in an iPod, iTunes "sees" it.

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