There is an issue open about this module not working out of the box, https://github.com/backdrop-contrib/panzoom_images/issues/1 so I'm not alone. Others have encountered this. I'm wondering if anyone can explain how to configure the module and get it to work.
Recent comments
Could be a trivial thing like Permissions -> Access administration bar (for a role)?
User seeing admin stuff
Can you paste or screenshot the error you encounter?
How to upload js and gz files
wont work, it is hard coded to be blocked.
How to upload js and gz files
Make sure it's a file field and enter the allowed file types, e.g.:
How to upload js and gz files
Wow, that sounds awful... So maybe it's not even related to other modules, but some... cache problem somewhere? Be it browser or server-side? A Heisenbug.
How to troubleshoot interactive image cropping modules?