On my 2011 13" MBA, I see a pretty big disparity in how much space I have on my machine. In the drive "Info" it says I am using 46 GB. In the "About this Mac" storage section, I am using about 74 GB. When I created a fresh TimeMachine backup, it was about 61 GB. Do I have some cache or something somewhere? My trash bin is empty. Attached are screen shots. Thanks!