I am only on version 4.8.8 but also share a puck between a Win10 laptop
My puck is a VFAN UG353 and it came with Ublox software
Normally I just have to check that the Ublox is not running at the same time and that the COMM port agrees between Windows and Ublox and OpenCPN. The baud rate is 9600. The GPS seems to 'sleep' while the Options tab is open, I have to close the Options window before the coordinates update.
Have you tried a swap while both computers
are running? Other than COMM port number, the settings from the tablet should be the same for the PC. The filtering setting does not seem to make a difference for me.
I am not a 'rocket scientist' with any of this stuff, it took me a while to get my Garmin
GPS/fish finder to talk to OpenCPN. It's a nice feeling when it comes together.