[TSVN] failure in revision graph

I see the error dialog attached to this message each time I try to
generate a revision graph on any file in my copy of the repository.

I'm running WinXP, SP2. I've used 3 versions of TSVN, but currently
experience this with the latest:

TortoiseSVN 1.2.0, Build 3602
Subversion 1.2.0,
apr 0.9.6
apr-iconv 0.9.5
apr-utils 0.9.6
berkeley db 4.3.27
neon 0.24.7
OpenSSL 0.9.7g 11 Apr 2005
zlib 1.2.2

When I first select a file and right-click for the revision graph, I see
revisions counting down, then a pause at 1336 (problem there?), then the
attached error dialog.

Any help would be appreciated.

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