I recently upgraded my Xcode to 4.2. Since then my Organizer-Repository stopped working. Initially it said \"Host is unreachable\" and placed red dot every where.
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Had the same problem. The dots are green in the list of repositories but it just refuses to commit changes or update status, though compare works fine.
I opened Repositories, then on the left pane selected the project under the repository item. In the bottom-left of the window you'll have two buttons, Update and Commit. I pressed Commit there and it worked fine. However, after that it still wouldn't commit through the project (Alt+Cmd+C or through File menu). Not sure exactly what's going on.