VS2010 Hotfox of 13 Dec 2012 breaks Kits

I am trying to build an very basic UI application in Qt5.rc2 which built and ran nicely on 12 Dec 2012, but after the MS VS update with hotfix on 13-dec-2012, I can not build anything since I now get Kit faults. Qt5.rc2 QtCreator IDs the VC 2010 compiler, but will not add it to a kit, apparently due to perceived incompatibility with the Qt5.rc2 libraries now. I even tried to back out the hotfix as best I could, re-installed VS/Vc2010 (after removing it) and the SP1 (takes a full day to do that), and Qt5.rc2 itself to no avail. I then tried to build Rc2 from sources but that completely fails to build with something from the hotfix still around. I am surprised everyone is not reporting this problem.