I do not need a solution (just sharing information)
With Symantec Patch Management 7.5; On a Windows 7 system, MSWU-1000 (KB2991509) is being downloaded and installed BEFORE MS14-051 which causes subsequent opening of Internet Explorer to download pages instead of opening them. Once MS14-051 is installed, the behavior of Internet Explorer returns to normal.
KB2991509: Internet Explorer may become slow or unresponsive when web applications implement consecutive modal dialog boxes (Prerequisites)
http://support.microsoft.com/kb/2991509#prerequisites
Last Updated: August 21, 2014
"You must have MS14-051 Cumulative security update for Internet Explorer installed to apply this hotfix."
Attached is a screenshot of what a user may experience.