After installing v1.2 beta 2 and setting up demo mode then selecting save, screen greys over and hangs. Nothing in the ccm/logs indicating an error with memory or anything. Also can still navigate Configuration and group configuration without a hang. But whenever go back to advanced configuration it hangs. This same system ran V1.1 GA without such issues.
Attaching a 3rd file, a little more detail on windows Explorer vs Firefox. Error says - "error while loading categories. No categories found." see hangIE.jpg file.