Adobe Acrobat Reader DC

I am getting a windows warning when I have an open adobe PDF every time I try to choose send in an email. I can get around this if I start the email and look for my pdf attachment but it has been a real inconvenience to do it this way since I am sending multiple PDF's sometimes. This just started with the latest and greatest Adobe Acrobat Reader DC. This is what the windows problem says when I try to pick send an email in an open PDF.

Is anybody else having this? Is there a fix?