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
Turn off the cache. Turn on Error messages to display - All. Switch to default / other Theme. Switch to default / other Layout. Clean all ceshes. Check Status report....
update block doesn't work ( bug ? )
I just tired again, even I click the "save layout", the block still doesn't changed/saved.
update block doesn't work ( bug ? )
yes, it works if I save it on the custom block list ( /admin/structure/block/manage/ )
update block doesn't work ( bug ? )
My mistake was using the title/name of the page instead of node number.
Bookmarks in menu
Yes, that is more 'neat' - to my liking - and it works
Bookmarks in menu