"Internal error" invoking Cover Designer in Nero 6.6.0.16

I have an MP3 compilation opened in Nero Express 6;

then I open the “More>>” panel at the bottom;

then hit the “Cover Designer” button to open the Cover Designer.

As soon as I do, I get an “Internal error” dialog, then Windows shuts down Nero.exe because of an error in ntdll.dll.

Anyone have any ideas?