On Mac OS X, when a user with administrator-access privileges updates Eclipse plug-ins or any third-party plug-ins in Flash Builder, the plug-ins are placed in a user-specific folder within the workspace. Because the plug-ins are placed in a user-specific folder, only a user with administrator-access privileges can use these plug-ins. If the account that you are using lacks administrator-access privileges, you can't use these plug-ins.
Keywords:
Flash Builder, Flex, Eclipse, third-party, plug-ins, updates, issues, Mac OS; cpsid_89514

