Difficulty in comparing renamed folders

If I execute the following sequence of steps

- rename a folder containing at least two files,
- change two files in it,
- right click on the renamed folder in the Repo-browser and get the log
  messages window (_without_ 'Stop on copy/rename' selected),
- select one version of the folder pre-rename and one post-rename,
- right click a selected version and 'Compare revisions',

I get a window popping up "Changed Files", with a list of the changed
files in that folder.

So far, so good. But double-clicking one of those files does _not_ bring
up the expected TortoiseMerge window. Instead, this happens

- A dialog "Please wait..." pops up, saying "Getting file <URL of
  renamed folder> Revision <earlier rev>"

- I get an ugly error message "PROPFIND request failed on
  '/svn/imp/!svn/bc/<earlier rev>/<later path>'
  '/svn/imp/!svn/bc/<earlier rev>/<later path>' path not found".

I can work around it by manually looking up each file identified as
changed, getting the log of that file and doing a diff, but the
exhibited behaviour doesn't seem right to me.

The closest match I could find on the mailing list is discussed at
http://svn.haxx.se/tsvn/archive-2005-12/0188.shtml, but it isn't really
the same scenario (and that bug was fixed).

Using Tortoise 1.4.5 build 10425 on Windows XP, server 1.4.3 (r23084) on
Windows 2003.

regards,

--
Jon Ashley
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