ok. run runescape with your client, as if you're doing the bot. turn off the bot, and let runescape load. on the screen should be a little button with the picture of a computer on it. either that or there will be two tools crossing each other, can't remember.
once the menu is open for display settings, choose custom. There will be four boxes side by side saying things like Safe Mode, OpenGL, DirectX, and something else, that again, i can't remember. click safe mode, then x out of the box. the flickering should stop
could you take a picture of the bot when it runs? a picture of the GUI(where you choose what course and all) would be best