I seemed to be maxing out my RAM when I had Adobe Lightroom, PhotoShop, and DxO's OpticsPro 10 open, which are the 3 apps I use in tandem quite a bit. So, I bought 8GB's more RAM (not a great deal but as much as I can afford at the moment), popped it in on Saturday, and was happy to see that I seemed to have plenty of RAM when the 3 apps were open. By the end of yesterday, however, almost all of my RAM was being chewed up. I opened Activity Monitor this morning and saw that almost 10GB is being used up by "File Cache". Is this normal? Right now - after installing the 8GB's and after 1.5 days almost being back to where I was before I bought the additional memory, it feels like I'm in a Memory Black Hole. Any insight?