Yes serial to USB converter could very well be the issue if only just replaced in the same time frame. Have no background with Win 11 but quite a bit with Win7 and for Win 8 Davis produced a Win 8 version. That would certainly be my starting point, the new adapter?
And just to confirm this is a serial logger?
Also FYi the original Davis USB Serial (DB9) #8434 worked up until Windows 7/ME/XP/Vista etc, #8435 was required for Win 8. What I am not sure of if the #8435 was a Prolific or FTDI chipset?