I have set up a site with multiple roots, each one pointing to a set of different domains in Culture and Hostnames (each set is the external domain for the client to see, the internal domain (xxx.local) for me to see the published result, and a xxx.localhost domain to work with from VS - running the project on IIS instead of dev server).

Not all URLs resolve to the same machine - there's a couple of development machines and a server to which the site is published, so the .localhost domain is used for the dev machines while the .local is used to see the sites from inside the office (to avoid loopbacks since the server is inside the office) and the external domain is used by the client.

All URLs in the "Info" tab for all nodes are coming up blank - although URLs are resolved correctly when viewing the site.

Any insights on why this is happening / how to fix that?

(It's essentially many sites in one Umbraco setup)