Mozart hangs when I use a percussion stave with few lines in use?
This has been reported on one or two computers and has been traced to a bug in the video drivers. Such bugs can cause problems in random places in any program. To check if it is a video driver problem reboot your computer in safe mode, or disable all acceleration features in the video driver, and repeat the operation which caused the problem. If all is well, then a video driver problem is indicated. Either download debugged video drivers from the video card manufacturer’s web site or use your computer with a lower level of video acceleration se in the control panel.