Are we expected to manually include the "extensions/SemanticMediaWiki/skins/SMW_tooltip.js" file?  Mine did not pop up at all until I did this.

Also, some of the toolips flash for me while others work fine. For example, when you move the mouse pointer over the link, the tooltip flashes on and off so it is unreadable. In Firefox 2.0 this is continuous, in IE, it sometimes stops if you stop moving the mouse.