On Tue, 10 Jan 2023, Pavel Sanda wrote: > Ok. Do you know what Qt version was used on your system for previous > 2.3.6? Pavel, qt-4.8.7-x86_64-4 (installed Jan 17 2021) qt5-5.12.8-x86_64-1_SBo (installed Oct 2 2021) and lyx-2.3.6.1-x86_64-1_SBo (installed Oct 31 2022) So, it's most likely that the lyx upgrade used qt5-5.12.8. Regards, Rich