I’m running ACF 5.0.8 on WordPress 4.0 and Chrome. This is a very small bug. Enter a destination into a location field and save the post. Then, highlight all of the text in the bar above the map, from right to left. Click down in the whitespace to the right of the text, drag across it to highlight, and then release the mouse just to the left of the text. Once all of the text has been highlighted, it appears that the text is editable, but pressing keys on the keyboard does nothing.
This is more of a problem on my frontend form, because dragging to the left outside of the field still causes the problem. I’ve done this many times and I think that to some of my users, they might be confused as to why they can’t edit the text.