Just tried a few of your recent builds on my WIn10 PC… Haven’t had any problems with any builds this year that I can recall.
RawTherapee_dev_5.4-795-g6f6cdd113_WinVista_64 = is working
RawTherapee_newlocallab_5.4-1156-ge9d4dede4_WinVista_64 = is crashing
RawTherapee_waveletnew_5.4-962-g8d3862206_WinVista_64 = is crashing
Wiped out my options in appdata this time for full fresh install and still crashing. Can’t remember what to do if I run the debug exe to give you further details… Both the crashing builds open then crash and immediately disappear when I try to open a folder.