What version of Racket are you using?
8.16.900
What program did you run?
Open DrRacket. Close all windows using cmd-W. Try to open a new one using cmd-N. Hear a beep, see no window opening
What should have happened?
A new window should have opened.
If you got an error message, please include it here.
Please include any other relevant details
Could easily be macOS specific. I ran this test on Sonoma 14.6.1
@rfindler reports that the bug is also present in v8.8, and that in 8.3 it does something worse, not allowing you to close the last window.
This could easily also have arisen as a result of changes in the OS, rather than changes in DrRacket.