Hi,
elements (like <layer>, <plugin>, <hotspot> and <events>) without
keep="true" will be removed when loading a new pano/scene!
And a new scene (the first scene) will be loaded directly at startup (see the 'onstart' event and the 'startup' action).
That means - just add keep="true" to your your "panoevents" <event> and "introimage" <plugin> element.
Best regards,
Klaus