SDL Trados Studio 2017 SR1, CU7 vs error from SDL Xliff Converte

Hi, since installing the latest version of SDL Trados Studio 2017 SR1, CU7, I run into this error message when converting MSWord docs back into xliff using the SDL Xliff Converter: 

Could not load file or assembly 'Document Format.OpenXML Version=2.6.0.0 Culture=neutral, PublicKeyToken=c28cdb26c445c888' or one of its dependencies.The located assembly's manifest definition does not match the assembly reference."

Any advise please?

Thanks, Edwin