Karl,
What transceiver do you have that won't work with later fldigi versions?
Is the issue rig control or fldigi functions?
Do you have 2 different configuration directories for your two radios on the same machine?
If so on the one for 4.1.23 go to it's directory and rename the fldigi.prefs and fldigi_def.xml files by adding a 1 to the name. Now get fldigi version 4.1.23.24 from ?and install that. Use that for the transceiver that would only work on 4.1.23 and see if it works with a new config. You will have to set it up again, but with just a basic setup you should be able to tell if it will work. I would be very surprised if it wouldn't work.
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This is only a guess but windows updates seem to have a negative effect on some programs. I also guess the windows OS in china machines may be different as well. But the updates are not only intrusive and annoying but may affect some aspects.
I have a receiver that works flawlessly through fldigi on both 1.4.23 and 1.4.23.19 but a tranceiver that will work ONLY on 1.4.23 version of fldigi.