[Koha] 3.6.2 - System preferences cannot be updated

[Tom Hanstra]

I'm running into a problem with changing System Preferences values.  
When I attempt to make a change, I get these errors in the message log

Message Log

    * Error; your data might not have been saved
    * You need to log in again, your session has timed out

The session has not actually timed out as I can continue to go to other 
screens and navigate the Staff Client.  I've checked permissions on 
files and database access and these are not a problem.

Does anyone have an idea on what might be happening?  Anyone else seen 
such problems?  I'm seeing this on two different instances of 3.6.2.

Thanks,
Tom

-- 

-----------------------------------------------------------------------------
      Tom Hanstra                              Systems Administrator
      University Libraries of Notre Dame       Phone: (574)631-4686
      213 Hesburgh Library                     Email: tom at nd.edu
      Notre Dame, IN  46556

           Time flies like an arrow.  Fruit flies like a banana.
-----------------------------------------------------------------------------