Hi John,
Thanks for reaching out to us, and sorry to hear about this -rather strange- issue you are experiencing.
As George points out in the thread you link, first thing to do is update to the latest versions of our products -we just released 3.11.1 a couple of hours ago. After doing so, next step will also be to go through the steps outlined in our Testing for conflicts guide. If the issue is still present with WordPress default theme and no other active plugins, then I would appreciate a description of the steps to reproduce this. That way I can try to recreate myself and check if this is a bug. Another useful thing to have is your system information, if you include that in your reply please make sure to mark it as private.
Looking forward to solving this,
Best,
Nico