So far this build is working fine for me. I only got a problem with the program update using the setup. With all previous builds (5.1.xxx) I had a freezing computer when I updated the program through the setup. Both my old P4 and my "new" Quad Core had these phenomenon. Though the last update worked fine on my P4, while it did not on my Quad Core. The only difference was, that I allowed the requested reboot on my P4 and told my Quad Core to restart later. Any one else noticed these phenomenon? It also happened with the build in updater (when I updated from 5.1.xxx to 5.1.yyy). It is a minor glitch for me, as the uninstall procedure, reboot and installation procedure works fine.