After installing Grammarly for Windows, when I double click on a ChemDraw embedded structure in Microsoft Word, it opens a blank ChemDraw document with no structure.

We are aware of this when users have got premium version of Grammarly activated. This has been reported to the Grammarly Support team also. In the meantime, you can turn off Grammarly in Microsoft Word. To do so, please click the G icon on the righthand side bottom and press the Options button:

Then, click Turn Off suggestions in Microsoft Word