Drupal 8 has a Views setting for block displays that allows you to hide them when there are no results, empty text or headers/footers. I thought Backdrop had a similar option (or maybe that was D7) but I couldn't find it...
Drupal 8's empty block setting
Recommend adding this to Backdrop (if not already) and putting it under 'Block settings' section (for some reason Drupal has it at the bottom of the 'Other' section).
Recent comments
Backdrop CMS: 1.34.0 Installation profile: standard PHP version: 8.4.21 Drupal 7 compatibility: on Database server...
User seeing admin stuff
Sounds maybe like something is caching pages for all users when it should be caching per user -- just a wild first guess. (If this was so, she would have gotten an error if she tried to click on...
User seeing admin stuff
This appears to be the issue that was created, https://github.com/backdrop/backdrop-issues/issues/6401
format for image upload directory spec