I am using ST4 Build 4107 on Ubuntu 18.04.
When I open and close most settings under preferences, ST4 crashes upon closing the window, regardless of any already open files or windows. I am not clear if this has something to do with the group that is created when displaying the default and user file settings or not, but I cannot seem to duplicate the effect unless I choose to display a settings group.
I am not sure if there is a connection, but prior to this happening, I experimented with changing encoding to DOS CP437 to see how some legacy files using ASCII box drawing characters would display. I have since changed back to UTF-8.