When this happens for me, it's usually because the SCM subsystem has
switched itself off after bumping into something it couldn't handle.
Check the project inspector to see that SCM is still enabled for your
project.
Good point. SCM (at least CVS) in Xcode is somewhat fragile. If it
fails for any reason, e.g. a file has a sticky tag or the connection
dies, then SCM is dead until you close and re-open the project. I filed
a bug report on this a few weeks ago asking that SCM be made more
robust, or at least be more demonstrative and descriptive when an error
does happen <rdar://3496227/>.
You can also open the SCM window from the SCM menu and drag the divider
upwards to reveal the SCM log. This allows you to see any SCM activity
in Xcode. If you're thinking about filing a bug report, they'll want to
have a copy of that log. A Terminal with top running can also provide
you with some interesting observations.
This is a great tip! I'd never noticed that divider before. I wish the
SCM Window size/position and the placement of the divider would
maintain their settings across Xcode/project closings. Bug Report filed
<rdar://3521220/>.
Rob
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