I recently acquired a Plextor 708a burner. I didn't have any troubles with it at all and was actually quite pleased with it's performance at both ripping and burning. That all changed when I tried to burn @8x speed.
I had previously burned 2x -R Verbatims and 4x +R Verbatims with no trouble at all. I then bought a box of 8x Verbatims in jewel cases. I burned 4 DVDs which turned out crap (jumpiness, pausing, weird blocks and whatnot) and only one which definitely works (I watched the entire movie).
I tried a different IDE cable, PX only drive on the channel, no software running in the background. Nothing helps. My standalone is a Pioneer 656 which usually plays just about anything. I burned with RecordNowMax and the drive has firmware 1.04.
Anything else I could try or is it just bad luck with the media?