Very rarely java built in hardware acceleration (HA) can lead to problems, especially on low-budget graphics chips and/or old/buggy drivers. So before turning off HA make sure you have the latest drivers installed which might already solve the problem. If it does not, here's how to turn HA off: Control Panel -> Java Control Panel -> Java. Press the button 'Show', then double click in the field 'Runtime-Parameter' and type or paste in: -Dsun.java2d.noddraw=true