title: Xcode code sense color/completion not working
body: <p><strong>EDIT:</strong> This is weird... if I double-click the Recent Projects item for the project in the welcome screen, code sense and coloring works just fine but if I just click <code>Open</code> (bottom right in welcome screen) it doesn't. Opening from <code>File &gt; Recent projects</code> does not work either and neither does double-clicking the <code>.xcodeproj</code> file in Finder.</p>
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  <p>Code sense for an iPhone OS 3.0 project I have been working on for several months (through different installations/versions of Xcode) is not working any more. For instance, if I do <code>NSString *myString</code>, all code would be black (no coloring, no Option + Double Click, no code completion). Code Sense only &quot;works&quot; for my own classes/methods/properties but not for any of the SDK classes. If I create a new project from scratch I do have all of these working.</p>
  <p>I already tried changing the &quot;Base SDK for All Configurations&quot; in this project. I already tried &quot;Rebuild Code Sense Index&quot;. I already tried &quot;Clean All Targets&quot;.</p>
  <p>Documentation in the Preferences is all downloaded and working. For instance, if I select the <code>NSString</code> above and do Right-Click -&gt; Find text in documentation, I get the window with all the reference to the class.</p>
  <p>Any ideas will be greatly appreciated.</p>