DVD playback issues

Hello all, have some questions I hope I can get answered.
I have been burning a number of bad discs lately, both out of DVDSP and out of Toast. I am running DVDSP 4.0.3 and Toast 6.1.1 on my G5 Dual 2 Ghz running 10.4.4.
What is happening is that quite often, the last chapter of the DVD will have playback issues in my set top DVD player where the picture freezes or it looks ike the color is breaking apart (I don't know the technical term for this).
It doesn't do it on every disc though.
I am using TDK DVD-R 8x and Memorex DVD-R 8x media and previously have never had a problem with either.
At first I thought I was starting to have a Memorex issue as it seemed to happen only on Memorex discs, but then it started on the TDK as well.
I have emptied the cache, run disk utility and disk warrior.
I burned one disc on memorex media that played fine in my computer, but not in my DVD player (a Sony), but DID play fine in another Sony DVD player.
I then burned the same disc on TDK media though, and it not only didn't play on my DVD player, it didn't play on my computer either, freezing up in the last chapter as always.
My drive is the SONY DVD RW DW-U21A, which I have considered replacing as 8x media is next to impossible to find and I'd like dual layer support.
my old burned discs play fine in my DVD player and SOME of the new ones I burn do too, but a lot of them do not. I don't think I have that many bad discs in the spindle.
Could BOTH my burner and DVD player be shot?
Anyone have any problems like this?
In a separate question, what is the Pioneer drive of choice to do 16x DVDs and also have the dual layer support and is it currently supported under Tiger or do I have to flash it on a PC? (I don't have a PC to do this on). I have heard the Pioneer ismuch better than the Sony.
Any help would be appreciated

For the stuff in DVDSP, it's happend on a number of projects, none of them longer than 90 minutes. Generally the target bit rate has been anywhere from 6.5-7.5 and the max is 8. I use ac3 audio at 192.
I've had issues burning disk images in toast though too with the same problem. They will sometimes play and sometimes not play. Once in a while I understand as you get bad discs, but this is like 40% of the time now.

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    libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_06_1.VOB (0x002fe800)!!
    libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_07_0.VOB (0x0032ce60)
    libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_07_1.VOB (0x0032ce80)!!
    libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_08_0.VOB (0x0035d560)
    libdvdread: Error cracking CSS key for /VIDEO_TS/VTS_08_1.VOB (0x0035d580)!!
    FATAL[ogle_mpeg_ps]: dvdreadblocks failed
    Last edited by sa (2008-05-30 01:19:27)

    Sort of looks like hardware issues to me.  Do you know that the drive works (i.e. tested in another OS, or it used to work and just stopped?)
    Did you try just mplayer dvd://  ?  That's quite a long options list you've got there.
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  • Replicated DVD Title Playback Issues (~ 1 out of 20 disks)

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    While there might not seem to be a clear-cut right way to pre-mastering for DVD-Video, for sure, none of the few best/professional workflows allow Toast in the process.
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