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Based on the above, my best guess is Wing was still analyzing sources (which is a somewhat complex 3-stage process; you can see its progress in the lower left of Wing's window) or perhaps it just failed to do some of the analysis until you took some other action (configuration change, or moving around the sources) to trigger it. If you have Wing 7, this _might_ match some other bugs that are being reported. We're looking into those now.