Hi,Robert Osfield. Thank your reply! I notice this keyboardmouse example is windowed. If I click the close icon of the window, the error messages appear. But If I press ESC key, no error message apperas. I think the problem occurs when rendering window is closed and the main loop is not end, if viewer will try to render to the window, this should be failed and error occurs. And how can I fix this problem because a lot of my program is show in windowed mode. And thank all the help again!
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