PDF will not save - security issue

If you have Adobe Reader DC, please go in and uncheck the “Enable Protected Mode at startup” by doing the following:

1)      Open Adobe Reader DC

2)      Go to Edit, Preferences

3)      Go to Security (Enhanced)

4)      Uncheck the box under Sandbox Protections – Enable Protected Mode at startup

5)      Close Adobe Reader DC

6)      Reopen and then you should be able to save a document without it disappearing.