Bingo! I didn't realize my Chrome was a couple versions down. Upgrading from 64-bit 80.0.3987.163 to 81.0.4044.113 fixed the problem. Many thanks...

I too am having this same issue. I am using the same code (copy/paste what was provided in the sample at https://www.mjtnet.com/manuals/v15/HTML/chromestart.html), and confirmed that chromedriver.exe is in the root of c:\. To ensure nothing was interfering with it, I closed all other chrome processe...