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We should track somewhere that IDE doesn't work properly when the JDK6 dp9 is installed on Leopard. JDK 6 installer puts AppleScriptEngine.jar into /System/Library/Java/Extensions folder. This jar file is compiled with jdk6 and because Extensions folder is shared by all installed jdk versions, this can cause some problems, e.g. new project wizard hangs. After this jar is removed everything works fine again.
I guess, ide is more appropriate component for that than mac installer.
*** This issue has been marked as a duplicate of 129227 ***