Yesterday I set up the submenu for “Start”, it worked perfectly. But now, not only the little drop down arrow disappeared, also cannot access the submenu “What is…”, you have to go to “Start” page to enter the submenu.
Also another weird thing might related is, my “Home” icon also disappeared. They didn’t disappear at the same time, that happened 2 days ago. I add a small plug-in to have it back, but it shouldn’t happen, no?