I have browsed through all options and cannot seem to find something that would cause this but every time I press the play button in the editor the map saves before playing. This can take awhile for large maps and is very frustrating.
yes its really frustrating… bump
Very old thread but I just came across it as I was having same issue. Apparently out of nowhere I was being forced to save map every time I tried to play in editor.
I worked out it was because of the Use Single Process option in Editor Preferences > Play > Multiplayer Options.
When this option is unchecked (ie using more than one process), you will be prompted to save the map before playing.