I installed AutoCAD Mechanical 2008 SP1 and when I click on Help, the help file opens and the Contents and Index tabs work fine, but not the Search tab. If I choose "All Documentation" and type some text, then click the Search button, I don't see any results from Developer Documentation, only User's Guide and Command Reference.
Also, when I double-click on a title, about half the time the result page shows "The page cannot be displayed". If I select "Additional Resources | Developer Help" from the Help menu, the same thing happens. I've tried repairing the install, but that doesn't help.