Irritating authentication problem - I can't *stop* svn authenticating as 'administrator'

Hello all,

Can anyone please suggest a solution to a very odd problem I have?

My setup uses an Apache server running Apache 2.2.4 / SVN 1.4.3 with
SSPI authentication. Access via https.

I normally use the Tortoise client, which works great. I'm sure that the
command line client used to work great, but now it doesn't. The problem
is that whenever I use the command line client to make a commit, the
svn:author property of the revision becomes set to 'administrator'
instead of my login name.

This happens with two different repositories on the same server. I have
looked at the Apache log, and 'administrator' is what is being passed in
the request. Why the server doesn't demand authentication - it uses the
SSPIDomain directive to force all userids to be in the main company
domain - I have no idea. I don't even *know* the administrator password
in that domain. (Although I do have local admin rights on both the
server and the client machines, and have certainly therefore logged in
as local adminstrator on both machines in the past.)

I can specify different user ids on the command line using --username,
but this has no effect. I don't even get prompted for a password.

I have tried

- running three different command line clients - SVN 1.4.6, SVN 1.4.2
  and one called 1.5.0 (dev build) which I compiled myself a year ago.
  No difference,

- completely deleting the Subversion folder in Program Files, running
  Crap Cleaner, and reinstalling,

- removing every registry key called 'Subversion' and all children of
  same,

- searching for every folder on the hard drive called 'auth' and
  deleting it if it looked like a Subversion auth-cacheing area.

I've even tried passing the option --config-dir=., and while that
creates a folder called 'auth' in the current directory, it doesn't do
anything else, like prompt for a password or use the specified username.

None of it makes a jot of difference. Every commit I make has
'administrator' on it.

How can this be happening??? It's really annoying me!

Best regards,

--
Jon Ashley
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