thanks again, I’ll try to follow this up.
thanks so much, Andrea – as it happens, I did move the .htaccess file, so I don’t think that’s the issue.
There may be a problem with the lack of www. support in WPMU, as my server (in a university, so it’s difficult to ask them to change it!) appears to need the prefix. However, the rest of the transferred site seems to work fine – it’s just the subdirectory blogs that are throwing up problems. Do you think it could still be a www. issue?
thanks again – your help is much appreciated.