Since r211141 we properly destroy and create the overlay root layers when the root layer is attached/detached, but we leave the graphic layers in m_overlayGraphicsLayers alive. They should also be destroyed and created, and their children should e notified too. This is what causes that the resource usage overlay disappears when navigating to another page, and also the reason why it's not shown initially when starting the Mac MiniBrowser and the setting is enabled.
Created attachment 300524 [details] Patch
Comment on attachment 300524 [details] Patch This has been fixed in r211683 in a simpler way.
*** This bug has been marked as a duplicate of bug 167850 ***