For some unknown reason, my hard drive is filling until no space is left. I have no programs open, and I just sit there watching the free space in finder slowly go down. If I delete something to free up space, it is eaten up right away. I can't find any process in activity monitor that might be responsible and a reboot does nothing. I have zero kb free space right now and no way to change it. What could be causing this? Can anyone figure out the problem? Thanks in advance.