repository split and subsequent working copy switch problems

Ok, based on previous messages on the list here I've split my single repository into two.
Previously I had one repository in /var/svn/repos with two top level directories, say foo
and bar. I split this up with

svnadmin dump /var/svn/repos |svndumpfilter exclude foo | svnadmin load /var/svn/new/bar
svnadmin dump /var/svn/repos |svndumpfilter exclude bar | svnadmin load /var/svn/new/foo

Then I adjusted my apache config to use

        SVNParentPath /var/svn/new

rather than

        SVNPath /var/svn/repos

so that http://localhost/var/svn/foo and http://localhost/var/svn/bar point to the two new
repositories and I also moved /var/svn/repos to /var/svn/new/repos so that I have access
to my previous repository at http://localhost/var/svn/repos and the two new ones it has
been split into.

Now I have some working copies kicking around that had the old repository URL's so I'm
trying to switch them to the new ones. A simple switch like

svn switch http://localhost/var/svn/foo

gives

svn: REPORT request failed on '/svn/repos/!svn/vcc/default'
svn:
Ununsable URI: it does not refer to this repository

but

svn switch --relocate http://localhost/svn/repos/foo http://localhost/svn/foo

completes quietly and svn st ; svn st -q; svn st -qv are all happy but both svn st -u and
svn up complain with

svn: REPORT request failed on '/svn/config/!svn/vcc/default'
svn:
Invalid editor anchoring; at least one of the input paths is not a directory and there was
no source entry

None of what I have is particularly crucial to me so I'm not terribly worried about it but
this seems like something isn't quite right, whether it's me or "it" is another question.

Any ideas on how to complete the switch or is this perhaps a bug?

Also, what's the !svn/vcc/default stuff all about?

-- 
Cheers,
Derek
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