I keep trying to free up space on my MacBook Pro. When I try to Empty Trash, it shows it starting, but then it locks up. How can I fix this? Also, I have deleted many photos from within iPhoto, and then I empty the iPhoto trash. And yet, checking with Finder, I find that I actually show LESS available space on my hard drive than before. I also wonder, is it time for me to upgrade to Mountain Lion finally, and will that help with any of these space problems? And will that help my system resources so that I can show videos without them stopping and starting, like is happening more often lately. Thanks.