I have been struggling on a way to mark the viewed panoramas on the thumbs.
Finally got it working.
if(i LT scene.count,
txtadd(thumbname,'thumb_',get(i));
openthumb(get(thumbname));
set(plugin[get(thumbname)].onclick,set(effect,glow(0x000000,1.0,2,10000));set(events.onclick,null);closethumbs(); loadscene(get(linkedscene),null,MERGE,BLEND(1)); );
inc(i);
openthumbs(NEXT);
This changes the border to black when you click the thumb and open a panorama. I guess there are many other effects you can use.
Works fine both with the thumbs staying open and with the closethumbs() action.
If you want the thumbs to open at start and stay open just ad openthumbs(); to the startup action and remove the closethumbs(); from the code above.
Hans