I'm using an late 2011 Imac 2.7 GHz Intel I5 8gb ram, OS X 10 7.5 and I edit with FCP 7 HD, I'm editing Panasonic AVCCAM clips logged into FCP as Apple Pro Res Proxy. All of a sudden I'm editing and there is a delay after every single move I make and I get the spinning beach ball after each edit try. It was working fine last time I worked and all of sudden it is not working. I trashed the preferences but still did not work. One option is that I'm looking to copy and paste the entire project into a newly created project to take care of any corrupted footage, possibly (this was a great creative cow forum suggestion) but I've created an offline project to re-connect at a later time after editing and now I am worried that I may mess something up when reconnecting full-res footage at a later date if I create a new project. Any suggestions would be graciously received!