Diff tools crashes when finding differences made between 2 revisions in a shared repo without trees

[Nicholas Allen]

Difftools cannot be used to look at the differences made between 2 revisions within a shared repo that has no working trees. When I try this I get the following crash:

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    attaching the crash file
        /home/nick/.cache/crash/bzr-20100130114135-8174.crash
    and including a description of the problem.

    The crash file is plain text and you can inspect or edit it to remove
    private information.