Grammar checker returns ??? when errors



I installed the grammar checker plugin v1.3 for Studio 2015 SR2 12.2 on a new Windows 10 Pro (1607) PC.

However, each time I make a grammar error, all that this grammar checker shows are 3 question marks (???), but no description of the errors I made.

I also used the same version of Grammar Checker on a Windows 7 Pro PC ansd there Grammar Checker does indeed gives a description of the errors I made.

How can I make Grammar Checker work on my Windows 10 PC? Any suggestions?

Thank you.

Best regards,