I've recently got a macbook (pro, 13") and am not familiar with macs. My question is, often when using a program I get the little colorwheel that unables me of using the program for a few seconds, I think that'd be equivalent to the "not responding" issue in windows. Is that normal? Because I've always heard that we don't usually have those type of problems with macs so I'm not sure. I have 4GBs of memory and a 500GB HD with 371GB available, if it makes a difference.