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This is pretty weird. If I leave the IDE open but unattended long enough for the screensaver to cut in (I'm running Seti@home and a power saver screen standby) when I return from the screensaver all the windows are covered with scrambled characters. There seems no way to clean this up, and if they IDE opens further windows they are scrambled too. This makes it almost impossible to save any altered files. Oddly, this even happens if the IDE is minimised. I noticed something similar happen to the guy that introduced me to netbeans but I don't have the details.
This is not bug bug in netbeans .