SharePoint 2010 : Context Menu Duplicating Menu Items:

I haven’t find any solutions other than the steps below, which can fix the issues that related to context menu duplicating items:

1.       Locate the folder in the production server : C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\TEMPLATE\LAYOUTS\1033.

2.       Locate the “core.js” and “core.debug.js” file and make a backup core.js and core.debug.js files [Important: Do not edit the existing core.js file].

3.       Edit the .js file and search the string for each menu item, if founds comment  the function (/*…*/).

4.       Reset IIS.

I have tested in my VMware and you can see the changes before and after, the “Alert Me” button is not showing up now:

And the result goes as below:

there is one drawback – the change made will affect all the web applications that we have on the server.  Also, it is in production server, so we be in very CAREFUL.