Fill and sign cannot attach image file

Adobe Reader DC, latest version running on RD Server (2008R2). Since last week users cannot attach an image file to fill and sign signature. You choose select image , browse to the image and select it and nothing happens. Takes you back to the select image. Removed and re-installed using the correct installer, updated, re-booted the server. The client also uses Acrobat DC full version running on the same server and attaching signatures using PDF or JPG results in "Unknown Error".  In both instances you can type or draw a signature without issue.