I just ran into this problem although im running W7x32 with Office 2013. In my case uninstalling KB2827238 fixes the checkboxes. I will note that when the update installs, it shows up 4 different times under installed updates and I had to uninstall all
4 before the problem was fixed. If I reinstall that update it breaks again.
Mine is working normally again but I think it was after some further updates. I have been busy and traveling so hard to tell what fixed it but my guess is in a later updated this got taken care of.
I did uninstall a bunch of the fixes originally but had not worked so hence I am guessing later fixes got it back to normal. sorry I dont have any further info but here are all the updates I have in if you want to try and track back.