hello!
i get this problem too unless i open the editor in compatibility mode:
- browse to and right click GraalEditor.exe
- click 'Properties'
- click the 'Compatibility' tab
- tick 'Run this program in compatibility mode for:' and select 'Windows XP (Service Pack 3)'
- click 'Apply' and then 'Ok'
*note this may also be fine if you select Windows 7 or Vista etc, i just know it works for me when i select xp