Graphics issues like: bad framerates, weird colors, OpenGL errors etc. Bad graphics ar usually the result of bad graphics cards or drivers.
Forum rules
In order to help you, we need to know a lot of information. Make sure to include answers to at least the following questions in your initial post.
- what OS (Windows Xp/Vista, Mac etc.) are you running? - what FlightGear version do you use? - what graphics card do you have? - does the problem occur with any aircraft, at any airport? - is there any output printed to the console (black window)? - copy&paste your commandline (tick the "Show commandline box on the last page of FGRun or the "Others" section on the Mac launcher). - please upload a screenshot of the problem.
If you experience FlightGear crashes, please report a bug using the issue tracker (can be also used for feature requests). To run FlightGear on old computers with bad OpenGL support, please take a look at this wiki article. If you are seeing corrupted/broken textures, please see this article.
Note: If you did not get a reponse, even after 7 days, you may want to check out the FlightGear mailing lists to ask your question there.