DAV locktokens clashing?

Any help with this would be very much appreciated - if this is the wrong
list please let me know where it should go.

I've got a reasonably biggish vhost with WebDAV over SSL enabled.
Users are only allowed to access their own parts of the site.
(I block them out with


Require user foo


Require user bar

)

Now and again, I'm seeing errors along the lines of:

user 'foo' submitted a locktoken created by user 'bar'

when user foo is trying to create resources under /a.

I can't understand how this is possible. Has anyone seen this before?
The DavLockDB is per-vhost, so I suppose it's possible the UUIDs are
clashing (but then they're not *U*UIDs, I suppose).

Clients are various flavours of DreamWeaver.

Thanks for any suggestions.

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