Using the digitally sign function often does not work the first time.

[Don355500970fca]

We have various pdf reports at work that I need to digitally sign.  To clarify, there is not a signature field; I go to use certificate > digitally sign and select an area to sign.  However, quite often, the signature does not show up on the document the first time.  It goes through the signing process and saves, but the signature does not appear and I have to repeat the process.  Does anyone know why this happens, and if it can be fixed?

[Don355500970fca]

Hi all, still having this issue.  Sometimes the signature will not appear at all (today I had to do the process 3 times before it finally showed up), sometimes I get an error about the file being read-only or in use by another user (which is impossible), and sometimes I get an error that the document was signed but there was a problem when saving.  Strangely enough, sometimes after getting either of these errors, the file did in fact save, and the signature did in fact get applied.  Other times, not.  

I did try to do a repair install at the recommendation of a friend, but that did not fix the problem.

I am using Acrobat Reader on Windows 10 Enterprise 64-bit.