flashing screen?

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mindstorms

When running your program, I got verticle bars on all four combinations of flipenable and vwaitable. I noticed alot more when they were both false, but (especially when I drew a rectangle on the screen) there was always lines or bars traveling up and down the screen. In the program I am working on now, by turning both to false I get a clear picture. I am now so confused, please help.

Happy Easter!