A customer has reported that since upgrading to 16.05 the tag editor for the 008 field does not open when clicked when using Internet Explorer 11. It works correctly on other browsers such as Chrome. This was reported at a similar time to bug 17695 - also an IE11 browser issue in cataloguing.
Created attachment 59322 [details] Screenshot IE11 Developer Tools From what I found in the depths of IE Developer Tools, it seems like this breaks it for IE11: https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=16400#c25
Indeed, removing $('#toolbar').fixFloat(); from addbiblio.tt brings back the value builders in IE11.
*** This bug has been marked as a duplicate of bug 18305 ***