I started my macbook this morning with bootcamp, so window 7 can have all 8GB memory. I thought I would run the original file with 21x21 grid again which is much prettier. I clicked on "Start Solver" at 12:44, and at 12:52 the graph starts showing up. It's 1:40 now, and its still going…only at column 13 on the chart…:P
(Update: the solver hit 20 Stagnant after 102 minutes, and didn't solve the problem)
another problem is…there is no F13 key on my mac keyboard…i can't do print screen…
(Update: Chris Norton said from Window Accessories there is an on-screen keyboard which has printscreen button. Thanks Chris!)