Why is my program freezing the whole Linux System when you open any dialog box?

[Awesome Programmer]

I wrote a GUI program using Lazarus compiler for Raspberry Pi4 (Raspbian OS) LinuxARM. It starts up and runs as expected except it freezes the whole system, whenever you open any dialog boxes like open folder/files that displays windows filesystem. As soon as you select the folder/files and click the button OPEN, the whole system/screen freezes and you have to reboot the system to get control back. However, the same program on a different Raspbian Pi4 which is supposed to be the exact versions of Raspbian OS does not have this issue. Can someone give me ideas or hints or clues as to why this might be the case. Greatly will be appreciated. Will updating and upgrading the Raspbian OS help?

[ALLIGATOR]

I've seen something like this before. It's probably not Linux that's freezing, but just the graphical environment. Since your application didn't return control, something like this...

You can press Ctrl + Alt + F2 or Ctrl + Alt + F3 to switch to another console.
But I’m not very familiar with this aspect of Linux - maybe someone else can help, or you can try Googling it or asking an AI.

[paweld]

https://forum.lazarus.freepascal.org/index.php/topic,63237.0.html

https://forum.lazarus.freepascal.org/index.php/topic,56626.0.html

https://forum.lazarus.freepascal.org/index.php/topic,61928.0.html