This is super helpful. While I still don’t fully understand what mixed content is (the pages explaining it require background understanding that I lack- I don’t get how/why a connection is in/secure and quite what the ‘available locally via https://’ means), that logo image was literally a placeholder for a logo that we’re currently having designed, so I’d been intending to change it.
On the blocking issue, a challenge is that many of the people we’re wanting to engage are mega busy, so having to call IT security to unblock a page may be one use barrier too many. But gonna add this issue to our user guides and suggest the solutions posed here. Thanks!