Mega Menu

Dear,
I’m using the MegaMenu that came standard installed in the LingerieTemplate/quickstart. I can find the joomlart/jm mega menu/manage menu groups, it wil display groups made.
When trying to add a menu item i first get the list  http://prntscr.com/639yl3 so no option to select menugroup and add an item, instead i have to edit http://prntscr.com/639z07 en use the back button to get the item list but the list doesn’t display any items created in the past http://prntscr.com/639zc9. The items should be there since they are displayed on the site http://prntscr.com/639zyv  http://prntscr.com/63a053 Did already cache management, reindexing … but still no menu items to see
Any suggestion
Regards