プロジェクトを開くと、エラー メッセージが表示されます
"
Subversion detected a working copy that needs an explicit upgrade in 'some directory'.
While this working copy is not upgraded all files in this working copy will appear as new.
When a working copy is upgraded it can no longer be used by Subversion clients that weren't designed for this (or later) working copy formats.
Further working copy upgraded required warnings are suppressed until after you restart Visual Studio."
この問題を解決する方法。Visual Studio 2012 Ultimate、Subversion 最新、および Ankh 最新バージョンを使用しています。