Problems with commit (Mac client accessing Win share)

We have a number of web site source trees in Subversion. The
production/staging sites are working copies on a Win2000 server. The
working copies were created by a WinXP client and placed on shares on
the server. In some cases, we have a need for other developers (Running
OS X (Mac)) to make minor modifications directly on a staging site and
then commit them. When the OS X guys try to commit, the following happens...

--------------------------------------------------
svn: Commit succeeded, but other errors follow:
svn: Error bumping revisions post-commit (details follow):
svn: In directory '/Volumes/stage'
svn: Error processing command 'committed' in
'/Volumes/stage'
svn: Error replacing text-base of 'about.cfm'
svn: Can't move '/Volumes/stage/.svn/tmp/text-base/about.html.svn-base' to
'/Volumes/stage/.svn/text-base/about.html.svn-base': Permission denied

Process finished with exit status 1.
----------------------------------------------------
(Permissions on the files mentioned are Everyone/Modify.)

Following this, everyone gets "Working copy locked" errors. Am I missing
something?

Thanks

-- 
Jack Baty
Fusionary Media - http://fusionary.com/
Weblog - http://jackbaty.com
"Everything is vague to a degree you do not realize till
  you have tried to make it precise"
                     -- Bertrand Russel
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