Ever since the release of 3.6.0.a, all my users have been recieving occasional messages about the upgrade being available (as well as a newer version of the search plugin).  I do not want my users to get those, however nothing I have found stops it.  'Check for updates' is not checked on the clients.  I tried installing the Spark Manager plugin as in the past that was mentioned that it could resolve this.  They only seem to show up on our spark clients (not our Pandion ones) so I assume it is something client side...

How do I keep those messages from going out?