I had about 14gb free space on my MBA 13, and I copied 2gb of images from a memory card. As I was scrolling [no editing] thru the images with Xee, I got a message saying that I was running out of space, and sure enough when I checked with Activity Monitor, I was down to 250MB or so. Was stumped till I saw that there was 10gb plus of 'pages out' in the system memory. I closes Xee, deleted the images, emptied the trash, and got the 14gb back. Any idea why this was happening? I have 4gb RAM and have never seen more than a few Kb of pages out in System Memory.