Gelato and Mango will install without problem most of the time. But occasionally, for an unknown reason, Mango does not install properly on Windows. If you have just installed a new version of Gelato and if Maya does not properly load the Mango plug-in or include the icons on the Gelato shelf, there is an easy fix to get Mango running.
The first thing to do is open the Maya plug-in manager and ensure that Mango is loaded. In Maya, go to the \Window\Settings/Preferences\Plug-In Manager menu. Make sure the Mango.mil plug-in is loaded. If the box is unchecked, check it. You probably should check the Auto Load box as well.
If this does not resolve the problem, reboot your system. Mango should now load normally whenever you start Maya.