We checked the problem here with a clean install of Windows 7 and CDT 6.0.9:
Windows 7 + IE9 + Patch = no problem
Windows 7 + IE11 + Patch = problem occurs when clicking on a user in the address book
Windows 7 + IE11 without patch = problem does not occur
As a pre-test I used the a2.html from this thread at Microsoft IE9/11 freezes in some situations after installation of KB2962872 . It hangs when Windows 7 + IE11 + Patch is installed (see above), somehow it does not hang with IE9 despite the thread's title.