Following Brogan's advice, I have cloned my site into a new domain, so from mysite.com to mysite.org, and I have deleted all the forums I do not want imported.
On import, the XF importer picks up the attachments as:
That does not work (says: The attachments directory could not be found) and changing it to:
It says the same.
Any ideas what might be going on? (The attachments are in the images/attachments folder and the vB ACP attachments directory is set to the same directory)