Commenting in Acrobat Bug

[gill6034 at comcast.net]

Has anyone else had this problem: 

In Acrobat, after making a PDF, I Save As > Reader Extended PDF > Enable Commenting & Measuring. Then when I give it to someone to comment on it in Adobe Reader, they get a message saying that the PDF has changed and commenting is disabled and to do a Save As Copy and put rights on that version. I do all that and it doesn't fix the problem. 

However, if the user has Adobe Reader DC, then they can comment on the PDF without issue. 

Is this a bug in Reader, is there a solution other than upgrading to DC? 

Thanks 
Gillian 
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