I was trying to do a basic search. I changed my search group from "in ALL" to "Mytag:" and my tagged theology set. I mistyped and put ; instead of : but caught my mistake and fixed it before hitting enter. I did not use the dropdown + clicking on the list of tagged groups. The result was that the "in ALL" dropdown option disappeared! I had "in" and then nothing. Opening a new search tab and setting it to basic search presented the same problem. Functionality was restored when I changed to a different layout. See screen shot. 
