I have 4 gigs of ram and plenty of hd space free, but some apps give me a low memory warning every so often. Most of the time, it happens in microsoft office 2008 (it is fully patched). This is on OSX 10.5.8. I have tried repairing permissions. Any idea what could be causing this? The last time I saw the error, i had close to 2 gigs of ram free lol.