Windows 10 install - Dashboards reporting "Culture is not supported" > C:\Windows\Globalization\treb-inv.nlp


I have installed Cherwel 9.2.0 Client on a Windows 10 (1607) 64 bit client and it installs okay and the software runs okay apart from errors on various dashboards eg My Work. See below. 

Culture is not supported. Parameter name: name. treb-inv is an invalid culture identifier.

This seems to be regarding the file C:\Windows\Globalization\treb-inv.nlp. I've done a search and not found any other examples reported. I also did a fresh install of Windows 10 64 bit (1709) and the only thing I then installed was Cherwell and got the same error.

Anyone ideas on how to resolve this ?