Confirmed, I have this problem too. It crashes immediately (the process briefly shows in Task Manager, then disappears) with no error and no information written to the log file.
Happens opening any file (.chitubox, .cbddlp, .stl) by doubleclicking or by using rightclick->openwith->chitubox.
Windows event viewer data related to the crash: Faulting application name: CHITUBOX.exe, version: 0.0.0.0, time stamp: 0x5f0c3206 Faulting module name: Qt5Core.dll, version: 5.13.2.0, time stamp: 0x5db2b3bb Exception code: 0xc0000005 Fault offset: 0x00000000001c8c30 Faulting process id: 0x4ee8 Faulting application start time: 0x01d663be4007ca94 Faulting application path: C:\Program Files\ChiTuBox64 1.6.5\CHITUBOX.exe Faulting module path: C:\Program Files\ChiTuBox64 1.6.5\Qt5Core.dll Report Id: 5d223cca-ff9e-41a9-ad5a-3aa23e54990f Faulting package full name: Faulting package-relative application ID: