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Created attachment 152898 [details] first screenshot, notice the progess bar and upper text I am using Gnome 3 with Ubuntu 14.10 with a multi monitor setup on an nvidia card with nvidia drivers. I experience that Windows are not (re)painted correctly. This happens in the installer as well as Netbeans IDE. Since I did not observe this with other Java/Swing applications I assume it is a bug in the platform. The behaviour can be observed with older versions of Gnome as well. This problem can be forced when switching to a different virtual desktop, waiting a moment for a state change that will change the window content off-screen and switching back. It happens without switching to another screen some times as well afaik. I will attach two sample screenshots.
Created attachment 152899 [details] second screenshot, notice the finish button and progress bar incomplete
Only known workaround: Resize window to force a full repaint. This is especially annoying when waiting for a long process and not noticing if it is already finished.