This is what is actually happening: Rip a disc, everything works fine. Put in a new disc, the software reads the volume information, but all you see is this:
You're thinking, "What the heck? It can't rip the new disc?" It's actually a bug in the display of volume information. Click one of the other copy methods, and the missing info appears. In this case, I clicked Full Disc, then clicked back to Main Movie and got this:
So, it's not that the program won't read or rip subsequent DVDs; rather, it doesn't display volume information until you toggle the copy method. It's a bug, just not what I thought it was.