could you elaborate on the sorts of graphical glitches you're experiencing? screenshots are extra helpful!
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Can't really get a screen shot of it, but whenever I'm on full screen and either click to advance dialog or move thr mouse cursor over the bottom menu the background flashes black every other time.
Like it's constantly reloading the background image, have re-download the game but still occurs in both 1 and 2.
hmm, this could be an issue with the graphics card/video renderer. see if your graphics card driver is up to date, if it's updated and the game still glitches you could try switching video renderers by pressing shift + g in game and selecting a different renderer (someone online suggested choosing opengl, directx, software in that order until one works). then restart the game.
i hope one of those fixes work!