Assuming you run a macro having the execution on halt at a breakpoint. In this state you cannot close the application, similar to when a modal dialog is open but the Exit command is not disabled. Clicking the window's X shows the reason but not when clicking Exit.
So I tested the following from within the Basic IDE: 1) In the Basic IDE, I created a Sub and placed a breakpoint inside of it 2) I ran the macro and the breakpoint was reached 3) If I try to close the window via the X button, I get the message "The window cannot be closed while BASIC is running." (this is OK) 4) If I try to close the window via File - Exit, nothing happens and I do not get a message (a message should be shown as when the "X" button was clicked) Then I ran the following test from within Calc (or any other LO application) 1) Open the Basic IDE and place a breakpoint in a Sub 2) From within Calc, run the macro (Tools - Macros - Run macro) 3) The breakpoint will be reached 4) If I click "X" in the Calc window, the window will close (I guess it shouldn't close, right?) 5) Then I went back to the Basic IDE and pressed the Stop button (to stop the running macro) 6) CRASH Many things to fix here. Tested with Version: 7.6.4.1 (X86_64) / LibreOffice Community Build ID: 60(Build:1) CPU threads: 16; OS: Linux 6.5; UI render: default; VCL: kf5 (cairo+xcb) Locale: pt-BR (pt_BR.UTF-8); UI: en-US Ubuntu package version: 4:7.6.4-0ubuntu0.23.10.1 Calc: threaded The exact same result happens in current master Version: 24.8.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 7850a7deb59b890c73dfd52bd5aced6a538e6349 CPU threads: 16; OS: Linux 6.5; UI render: default; VCL: kf5 (cairo+xcb) Locale: pt-BR (pt_BR.UTF-8); UI: en-US Calc: CL threaded