But this seems to be a small bug:
6.30 offers a "revamped status bar with added first/previous/next/last document browser buttons" (see http://blog.milenix.com/myinfo-6-30-is-now-available/). In my case some of these new buttons (the arrows to the right: "next document" and "last document") are hidden. Also the number of the complete amount of documents is not completely readable:

Apparently this has to do with the large number of documents in my topic (5353). That means four digits and the field in the status bar seems to be too small for them.