So, I've been using colossus library for a week.  It's been working great.  I have 3 GB of RAM, so I tend to not use DFD.  The sound quality turns out much better this way. 
Anyways, just recently, I've been trying to work on a piano track.  With 3 GB, I can't even load 50% of a piano sample before I run out of RAM.  Most instruments I can do just fine.  Another track I'm working on has 12 channels working great, but none are piano. 
Anyways, I have MORE RAM than last time I tried to make a piano track.  It worked jsut fine then.  How come I'm suddenly unable to do anything?