LyX ⇒ Lyx runs but does not show any window

[anmo12]

Hi,
after upgrading Lyx, when I open the application lyx fails to show any activity (I don't see any window), despite the activity monitor showsinglyx.app running. The lyx icon on the dock does not show the usual "dot" indicating that it is running. I tried reinstalling and restarting the computer. Running big sur 11.6.8


Any idea?