I have exactly the same problem. It happened when I updated to Mavericks. Now all my old projects (created before the update) get this message at the beginning. When I click yes then the project opens but I need to reconnect all media. This is a real pain since I have about 10 quite complicated projects on the external hard drive and I just can't afford to waste time reconnecting all media and fiddling with it. Any project created after the update works just fine, only the ones from before the update give me the error. I've tried virtually everything under the sun. If anyone came across the solution please please post. I'll keep you updated on how I get on. Andreas you might find this useful: Adobe Premier Pro Scratch Disk is Write Protected or Unavailable | Arcturus Productions Apparently helped a lot of people.
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