Other strangeness: The non-updated (3.6.1) Events Calendar Pro plug-in appears twice on the Plugins page for the Network Admin. One version is not activated, and the other one is. By the way, we are not trying to use this plugin on multiple sites; just the one. Also, and I don’t know if this is related, the Community Events plugin is activated on the network, but does not appear in the Plugins control panel for the actual site it is meant to run on, but instead only on the Network plugins page.