I have Sonic installed on both XP and Windows 7. I receive an error message in both cases upon exiting the program. Windows XP will actually notify me, in the details, that the problem has something to do with libpthreads. Looking this up on the internet I found pthreads had to do with a Posix system, and Windows, since XP, has moved on to a Unix based system. I was wondering if there is some dependency I'm missing such as a C++ library, or Net Framework 1.1. I had looked on this forum at some of the crash reports but nothing seemed to fit my case, but I hope some of this information will help resolve some of these issues. The Sonic Visualizer is operable on my systems so that I can use it, but I guess I am just a perfectionist after all.