By the looks of the scan, we can guess that the drive is correctly in UDMA mode by viewing the nearly optimal PI pattern.
We can also guess that S9 may be functioning correctly with this combination of drive, chipset, environmentals, and media. If there is any reason to doubt, go here for official firmware: http://support.benq.com/front/BenqMain.asp?MenuHead=128&ShowType=program&FileURL=service/driverlist.asp&Dataid=16041&downloadclass=Driver&product=3731&langu=null&ops=null&GenMenu=&RootId=undefined
Because the title is wisely market out, we can tell that it is a movie file. So test the quality by copying the files from the disc to the hard drive using DVDDecryptor at top speed with "ignore errors" turned off. If you scoot the "OK" box out of the way, you can see the number of read retries, and they will be zero on a healthy disc.
If possible, do this copy test with a different drive once or twice to be absolutely certain. This will test to see if errors (as viewed by scans) and data can be correctly reassembled into valid data. The copy test is much more "important" than any scan because it tests the new disc's valid data under actual in-use conditions.
Q-scan at "Normal" should be able to make the graph without a single mark over 350 to insure compatibility with your set-top player.
Since all of your new discs skip, do try one written at the very lowest speed to test in the set-top player. If that works, try one at written at 4x. It sounds like writing speed is having some sort of negative effect on compatibility with the set-top player.
If writing speed affects compatibility with the set top player and other dvd products, then try a sampling of different media.
If other media does this trick too, then exchange the drive.
If other media does not exibit the same error, then you have a good drive that does not happen to approve of the media you stocked up on.