Hi, About the ball's color (should be blue, sometimes I see black), lines (should be white, but have rainbow colors and seem to small) and mess onscreen (should be gone, but sometimes there): After running this app multiple times in a row, it seems it behaves different every time. It's not reproducable very well. Needs more investigation I think. If one of you wants to see what I'm talking about, just grab a R5 compiled page_flipper and todays build of Haiku. Should be fun to nail down ;-) Bye! Rudolf.