git-annex-3.20110705: doc/bugs/problem_with_upgrade_v2_-__62___v3.mdwn

On several of my repos, the upgrade to v3 seemed to take forever. A Crl-C followed by another "git annex upgrade" "solved" the problem in some cases. Sometimes, I had to also delete the .git/annex/journal dir to have the upgrade. I didn't notice anything special about the non-working repos to help diagnose the problem.

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