If you press and release the 'Alt' key without pressing any other key the app will freeze. Pressing the key again, or clicking in the window with the mouse will un-freeze the window. This is a known bug with windows (10 & 11), details here:
https://stackoverflow.com/questions/11623085/pressing-alt-hangs-the-application
A fix would require changing the event handling of the freeglut library.
If you press and release the 'Alt' key without pressing any other key the app will freeze. Pressing the key again, or clicking in the window with the mouse will un-freeze the window. This is a known bug with windows (10 & 11), details here:
https://stackoverflow.com/questions/11623085/pressing-alt-hangs-the-application
A fix would require changing the event handling of the freeglut library.