I have an end user that is running into a periodic issue where when she attempts to save a file that has been digital signed, Reader will become unresponsive and close. However, it doesn't happen all the time. For example, I was standing next to her and when she signed something, it saved just fine.
Anything I can do to help her?
Sorry for the delay in response.
Check if you have any pending updates, to check, launch Acrobat > Help > Check for updates. Also, try repairing the application to repair Acrobat/Reader > Help > Repair installation (Applicable to windows users only)
Also, you may try launching Reader with Admin rights.
If you already have found a solution to this problem, please update the thread with your findings that will help others.
For me Acrobat was crashing after I chose one of the two signatures available on my system.
I suppose I was impatient enough to not wait for the system to find my first signature and so I inadvertently added a second one.
When Adobe later found two signatures and prompted me to pick one, it became unresponsive after I made my selection, forcing me to end the task (windows).
I performed all of Tariq's recommendations upon restarting (launch as admininstrator, check for updates (were none) and repaired install.). Then when it came time to sign my document I was patient this time when I saw no signature available, it took a few seconds for the system to find my signature so I picked it and was on my merry way.