It seems like the ORCID lookup popup is no longer working on the DSpace XMLUI Demo site (http://demo.dspace.org/xmlui/). When logging in as administrator, starting a new submission and clicking the "Lookup" button next to the Authors field, nothing happens.
When clicking the "Lookup" button, the following error message is added to Chrome's console. Note that a screenshot is also attached to this ticket, which shows the console output.
Uncaught TypeError: h.dataTable is not a function
at AuthorLookup (theme.js:1)
at HTMLButtonElement.onclick (3152722….continue:306)
The same behaviour was found in Chrome and in Firefox.