I guess I'm the only one in the world that has not realized that Logitech has messed up their download pages so the G940 support downloads page says the version 5.09 is the latest version, but if you select the G27 wheel it says the 5.10 version has been around a long while - and in the fix list almost all the fixes are for the G940... Brilliant.
So - I guess this is common knowlege, but otherwise, go to the G27 download page instead to get the 5.10 software...
The G940 page with 5.09 as the latest version:
http://www.logitech.com/en-us/441/5855
The G27 page with 5.10 as the latest version:
http://www.logitech.com/en-us/441/5184