There is a major audio problem with the Lesson Greek 7 - Nominative on the "Learn to Use Greek" DVD videos. The segments where he's displaying what he's doing in Logos 4 are way, way, way quieter than the parts where he's a "talking head." I didn't notice it as much on the other couple chapters/lessons I briefly looked at, nor on the Hebrew chapters/lessons I looked at for comparison. It appears (or rather sounds like) they mastered the audio for this one really badly.
Also, my 2 DVDs are also labeled as Logos 3, not Logos 4, and they are identically labeled. I had to put them in my PC to find out if I indeed had both the Hebrew and Greek DVDs.
Replacements/resmastering might be something I need to contact Logos about.