Thanks! And, I *may* have a fix / workaround... I found that all the really bizarre behavior disappeared when I did the following: 1) Go to the Preferences > Security (Enhanced) settings page 2) Turn OFF the default-checked "Enable Protected Mode at startup" setting under "Sandbox Protections" 3) Restart Reader DC (as instructed) After doing the above, things work as expected, with no weirdness I can see. I will let others comment on why this setting that seems to cause so much trouble is enabled out of the box, and what "bad things" (if any) might happen by turning it off. ... View more

And I too am seeing [functionally] this same error... on a fresh Windows 10 install, and the latest Reader DC (same version as quoted above), once I have performed any of the actions from the "Fill and Sign" tool, I am unable to exit "back to the document" - including main menu functions like Save [As]. To be clear, I don't see the exact same error as mentioned above - I need to go back a version or two to see that error - mine just silently refuses to do anything useful as soon as you insert a signature [image] or initials (typed). It is beyond me how something this basic is in a shipping product, and for that matter, why this thread is marked "Assumed Answered" - the tool (for several versions, it would seem after spending the last day on this) is hopelessly broken. PLEASE fix this, and echoing the last poster from February, I will happily run any test, and supply any requested info or debug logs. EDIT 4/6/2017 =========== If the moderators do not change this thread back to an "open" / "NOT answered" state, I will be creating a new thread re-stating this problem... clearly this January "fix" mentioned did not do the job. So... moderators?  Will you please reset the "answered" state on this thread?  Or is it preferred that I create yet another thread? ... View more