Cloud files cause Outlook add-in to crash

All of our users have build 14.0.2332.0100.  We run Outlook 2016 with our email hosted through Office 365 (some with standalone and some with click-to-run version of the Office suite).  For certain users, any time they try to click on an attachment that is a link to a shared web file, Outlook crashes, and they get the message that the Symantec Endpoint Outlook Protection caused the program to crash.  With the add-in disabled, they can access the shared file without issue.  Any suggestions?  It does not appear to be related to the Office install.