For the past month or so I haven't been able to attach files from Finder to any program, whether it be Outlook, Safari, Firefox, Facebook. As soon as I pick a file to open to upload or attach, Finder freezes with the rotating circle and in Force Stop a message that the program I'm using is not responding. I can drag and drop for email but I can't, for example, upload a photo to FB. I assume this is a Mavericks issue...any ideas of how to fix this? I have a 2007 Intel iMac. Thanks.