"connection closed unexpectedly" and/or "not authorized to open root of edit operation"

Sometime in the past week or so, something with my subversion setup
has gone awry.

At first, it just seemed to be occasional flaky behavior with a
client - Subclipse usually, but I wasn't doing much work in the
repository so I didn't get to worried about it. Now, I've come to
realize that it's not a client issue.

Whenever I try to connect to the repository now, even just to get a
list of commits, whether from the command line, SVNX, Subclipse,
Subversive, or TortoiseSVN, I get a string of messages like this:

   svn: Network connection closed unexpectedly
   svn: Malformed network data
   svn: Network connection closed unexpectedly
   svn: Network connection closed unexpectedly
   svn: Network connection closed unexpectedly
   svn: Network connection closed unexpectedly
   svn: Network connection closed unexpectedly
   svn: Connection reset
   svn: Authorization failed

I've also seen messages like "Not authorized to open root of edit
operation." when trying to perform an update.

Oddly, every once in a while, it works fine.

I'm using svnserve via xinetd.d on os x. In Activity Monitor, I saw
several dozen svnserve processes running, which is strange, because
not very many people have access to the repository, and the way it's
set up, those processes should quit as soon as they're finished.

Access is controlled via an auth-db for granular permissions. I've
looked over all of the files and setup, and everything seems normal
AFAICT.

I've updated all the clients and the repository to SVN 1.4.4 and
restarted all the machines. Other than getting rid of the extra
svnserve processes, it didn't change the behavior at all that I can
see.

The last couple of things that happened on that box were:

1) I upgraded it to MacOS X 10.4.10
2) We installed an app called "Lingon" which helps you set up how
processes are launched, and used it to make sure Roundup starts
automatically via Launchd after the system reboots.

I can't see anything that could have affected subversion from those
two changes, so it may just be coincidence, but "everything was
working fine before."

Despite the "malformed network data" message, nothing else running on
the box (ssh, http, etc.) seems to be having any network trouble.

Any suggestions appreciated.

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