The white field above the control-bar with the X.
So one thing i found out myself, there was no text inside the box, because it was too small, Area high 100px didn't show the text, 150px is o.k..
But there is no chance to show the discription of the hotspot
only Current Projekt, Current Group or Current Panorama is available.
Any other possibility to show the discription of the hotspot
You have to add the appropriate instances of the Description plugin - configured as you wish - to your workspace and then you will have have option.
But I would still choose to do it using a Web site viewer viewer plugin.