FIXED: Microsoft has released an update that fixes the problem. It will be automatically delivered and installed with your other updates. (See http://support.microsoft.com/kb/2962872
Status from Microsoft (7/28/2014):
• The official article on Microsoft's web site now includes a "Known Issues" #3 that points directly to the problems we are seeing.
Status from Microsoft (7/19/2014):
• The IE Product Team has determined the cause of the reported and reproduced regression and has formulated a fix.
• The fix is currently in testing and is planned for delivery in the next IE Cumulative update.