Staz - I hope the fix to WINDOW OUTPUT will also allow access to the SCROLL BUTTON parameters. I just found that using SCROLL BUTTON to change scroll bar params after using WINDOW OUTPUT doesn't work, 'tho it doesn't cause a crash. Well, I've converted my program (compiles to 350K) and tested it. Aside from the couple of problems I've described on this list, the other changes amount to tweaking. I was even able to check the "Use registers for speed" box without causing apparent problems. The new program really motors. I draw a graph that plots data, does an on-the-fly exponential regression on the data, and plots 3 instances of that curve, all while calculating scale factors and printing some other data besides. This graph scrolls by redrawing on an offscreen gWorld and copying to the screen. The scrolling rate under the FBII compiled application was 148 redraws per minute. The app compiled under FBII has a scrolling rate of 876 redraws per minute. A six fold improvement. FB^3 is a real step forward. Regards, Charles P.