Vandrovnik 214 Posted May 10, 2021 Hello, I have this simple error demonstration. Please can you look at it, whether there is a mistake in the app? When not, I would report it to QC. Steps to reproduce: 1. click Show form B 2. click Show form C 3. close form C 4. close form B 5. click Show form B 6. click Show form C ---> application freezes This error does not happen: - if I remove TBasicFormForm.FormClose event handler (which contains just a comment) or - if I change in ObjectInspector tSecondaryForm.BorderIcons, so that it is [biSystemMenu, biMinimize, biMaximize] Kind regards, Karel Test75.zip Share this post Link to post