Links from other websites (known as ‘backlinks’) can generate a 404 – not found response from Textpattern if the url does not match.
While the site uses the same structure as its predecessor to help prevent this, some project articles use a different URL-only title.
An article’s URL-only title can be found in the Meta panel, and is auto-generated from the Title when the article is first created. It can be changed to match that of the earlier site; link-rot be gone!