[boost] Strange commit failure on release branch.

Folks, I'm trying to update the Boost.Math docs on the release branch but I get: Error: Commit failed (details follow): Error: File or directory 'html\math_toolkit\special\expint\expint_i.html' is out of Error: date; try updating Error: The version resource does not correspond to the resource within the Error: transaction. Either the requested version resource is out of date (needs to be Error: updated), or the requested version resource is newer than the transaction root Error: (restart the commit). Now the thing is I *have* made sure that the whole branch is up to date, and in any cases there are no changes to that file in SVN, so I'm stumped. Any ideas anyone? Thanks, John.