If you do not close all the open scripts in the Scripts Management Window before you close that window, the top menu remains the Scripts Top Menu and most of the menu items are greyed out. You cannot change the mode to Browse, Layout, Search, etc. You can quit. Quitting seems to be the only way to reset the top menu to normal. Quitting is not always possible if you happen to be using the main computer serving as the peer-to-peer server. Everyone else has to be informed that they have to quit Filemaker so you can restart the Filemaker serving as the peer-to-peer server. A pain for sure. (Apple, Yosemite, Filemaker Pro 14 latest update).
Let us see how long it takes to correct this bug.