Diagramly latest on Confluence latest worked perfectly 2 hours ago.
Confluence was secured with HTTPS reverse proxy and alas -- garbage instead of real diagrams.
On closer inspection image URLs are not including correct context path, e.g.
shall actually have been:
because context path "/wiki" is configured inside server.xml
On even close inspection I can see this:
<mxCell id="92" value="Internet" style="image;image=/download/resources/com.mxgraph
And this naturally does not contain image=/wiki/ in front of the URL...
Plugin shall be looking at application context when injecting img links...