@jwm22 The developers were able to identify the problem; a hotfix is available for download. The hotfix will resolve issues with the pop-ups which caused the game to stop either when developing a city or exiting a finished game (= your case). Please reload the WebGL version to make sure that you play the most recent version of Catan Universe. You can check whether you use the correct version by verifying the version code displayed in the main menu: version 1.3.0-868e3b31e is the most recent version.