OK – I will contact the developer of the plugin. I was going to go the route of disabling other plugins until I found the conflict, but decided to try the “change theme” option first. I will comment after I have had feedback from the developer. Thanks for all your help, input and concern.
It would still be worth temporarily disabling all your other plugins, with Weaver Xtreme active, to see if one of them might be causing the issue. If so, then reactivate the plugins one-by-one until the problem reappears.