Menus at top of header crash on IE11

Menus at top of header crash on IE11

In IE, if you operate the Hamburger, Workspace or Wiki menus (at the top of a wiki page) more than once, they stop working (do nothing).  You have to reload the page to get them to operate, again just once.

IE F12 developer tools console shows the code throwing an exception at:

var userDropDownMenu=$("zw-topdropdown");return userDropDownMenu?

"Object doesn't support property or method 'remove'"

This is apparently a problem specific to IE: http://stackoverflow.com/questions/18919560/object-doesnt-support-property-or-method-remove

My bug tracking id: GWZ1007.