svnadmin load assertion

I'm trying to load a dump created with p42svn into a repository. If I run
svnadmin load against an empty repo without the --parent-dir option, the
dump file loads with no errors and the resulting repo appears to be
correct. If I create a new repo, add a trunk folder and then try the same
svnadmin load with the addition of "--parent-dir trunk", I get an assertion
failure. Here's the svnadmin load that works

D:\P42SVN>svnadmin load d:\repositories\INEEngineTest <INEEngineUI.svndmp

Here's the one that fails

D:\P42SVN>svnadmin load d:\repositories\INEEngineTest --parent-dir trunk
<INEEng
ineOPC.svndmp
<<< Started new transaction, based on original revision 1
Assertion failed: is_canonical(component, clen), file
..\..\..\subversion\libsvn
_subr\path.c, line 120

This application has requested the Runtime to terminate it in an unusual
way.
Please contact the application's support team for more information.

I've tried every combination of things I can think of, and the net result is
that if I specify --parent-dir, I get an assertion.

I'm running VisualSVN Server 1.5.2 on Windows Server 2003. The svnadmin
version is

D:\P42SVN>svnadmin --version
svnadmin, version 1.5.1 (r32289)
   compiled Jul 28 2008, 18:01:23

Copyright (C) 2000-2008 CollabNet.
Subversion is open source software, see http://subversion.tigris.org/
This product includes software developed by CollabNet
(http://www.Collab.Net/).

The following repository back-end (FS) modules are available:

* fs_fs : Module for working with a plain file (FSFS) repository.

Any and all assistance/suggestion for things to try gratefully accepted.

Thanks,

Mike

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