I follow the statement posted here.
After replacing queue.llb and notifier.llb with newer version provided by NI, I can't use "find example.vi" anymore. Diagram of subvi was locked.
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3EA0756A4E034080020E74861&p_node=DZ52000&p_submitted=N&p_rank=&p_answer=&p_source=External