Can you provide some info about your system? Graphics card? Screeen resolution? Operating system? What input device (mouse or tablet)? This error has cropped up elsewhere recently, but since the person asking did not provide any details, we were unable to resolve it. If you are having difficulty posting in English, feel free to use your native language. We have English, French,Spanish, German, Russian and even a bit of Japanese covered by people here, so someone might be able to even answer in that language, provided a solution is available.