On further testing, if I click on the X button on the top right, it closes cleanly, but if I close via my own X button (see screenshot), that is when it gives an error, so it’s probably something I have done while creating the button. My button closes the app fine when there are no popups open.
Maybe a glitch into the CEF version. In the incoming ExeOutput 2023, we upgraded the CEF engine and we’ll make sure to test this issue if it persists. Thanks.