Media quality is the most likely source of the problem. The Benq DVD's that are being used are not the best quality (considered mid-grade at best). Try using Verbatim or Taiyo Yuden discs (Sony's 8x+R MIJ is retail TY). There are a few others out there as well. (Some TDK made in Japan, some Verbatim MIJ, Plextor to name a few).
As the burn speed increases as the movie is copied to the disc, it more than likely is causing excessive errors or possibly even falilures. This is why it skips or will not play at all.
The reason your PC will not read some is because it attempts to read the disc at a higher speed than the DVD players do.