Thank you, Das Attorney, for recommending that 'keyAdjust' be corrected. Just like the other posters in this thread, after updating to 1.40, my 'Adjust' key binding (the default Left Ctrl key), was no longer adjusting my stance in game when I pressed either the key combination 'Left Ctrl + W' or 'Left Ctrl + S'.
For my installation, the following steps correctly bound the Left Ctrl key to the 'Adjust' control:
Exit Arma 3.
Open in Notepad or another text editor the text file "{yourProfileName}.Arma3Profile". This text file is located either in "c:\Users\{yourUserName}\Documents\Arma 3" or "c:\Users\{yourUserName}\Documents\Arma 3 - Other Profiles".
Insert '29' into 'keyAdjust[]={};', as per Das Attorney's post: keyAdjust[]={29}; In my {userName}.Arma3Profile text file, 'keyAdjust[]' is assigned its value on line number 15.
Restart Arma 3.