PROPPATCH error when checking in/out and merge

I keep getting the following error when trying to commit a modified
image file to Subversion:

Commit
Clients\USCOST\dev\Success\Enterprise\8.1\App\Success\App_Themes\Black
\images\Account.jpg
Commit failed (details follow):
At least one property change failed; repository is unchanged
Server sent unexpected return value (400 Bad Request) in response to
PROPPATCH
request for '/svn/Success/!svn/wrk/09d36451-6082-914f-
b1a4-58d1a8f1f084/Enterprise/App/trunk/Success/App_Themes/Black/images/
Account.jpg'

The event log has:
XML Parser Error: XML parser error code: not well-formed (invalid
token) (4)

Does anyone have any ideas what could be causing this and/or how to
work around it.

Thanks,
David

VisualSVN Server: 1.6.2
VisualSVN: 1.5.4
TortoiseSVN: 1.5.5, Build 14361 - 32 Bit , 2008/10/24 18:06:34

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Received on 2008-11-05 22:36:22 CET