I will try again.I have a new build  HTPC .It consist of a dual core Atholon  AMD2.7 am2+  procc. Four gigs of ram ,avermedia tuner card  and a 9400gt video card and a Asus miniatx mother board  gforce 8200 chipset .I have been having trouble getting a mounted bluray iso to play with out studdering .I really have tried everything to no avail .It studders if i try to play from  mediacenter using  TMT3  or just TMT3 by itself.Makes  no difference is the iso  is local or on the network.Bluray plays perfect from the rom drive  just not a virtual one .I did a full install last night  and got it all to work perfect till i install the tuner card and did the live tv setup.Now back to studdering . I am running windows 7 ultimate 32bit .Could it be  my power supply ? I am running  a mini atx case with 270watt power supply .Only one hard drive also 200 gig .Amy ideas would be great  ...thanks  In advance ...

 that is not necessarily a windows media center issue since MCE does not natively support bluray playback.

have you attempted asking at VCDHELP.com?

 Yes i have asked  them for  help  but have not heard back yet .I even tried daemon tools  with the same result .I feel as you do about it not being a media center problem.I was  hoping that someone might have ran across it before and could offer some insight ..Thanks  for  your response ..

When I first started playing blu-ray discs the picture would shudder especially in panning shots.  I finally figured out that it was caused by the blu-ray disc being shown at 24 fps and my video resolution set at 60 hz.  Once I set the video card to 24 hz, the shudder stopped.  Give it a try.

 Thanks  i will give it a try ...Would  it make a difference if i plays fine  from the Rom .It only does it  when i am playing from a mounted iso .

barrettt:

When I first started playing blu-ray discs the picture would shudder especially in panning shots.  I finally figured out that it was caused by the blu-ray disc being shown at 24 fps and my video resolution set at 60 hz.  Once I set the video card to 24 hz, the shudder stopped.  Give it a try.

That would be a phenomenon known as flickering, not stuttering.  And if this were the solution, all 24Hz sources would exhibit the issue, including directly from the disk.

I suspect the problem is with DAEMON Tools.  If a movie plays just fine from the disk but the same movie won't play when in ISO format, that's the only thing different.

Also, was playing with TCP optimizer... There was a network throttling parameter in it that affected my BR playback using ISOs mounted with VirturalCloneDrive... (don't ask why, i dont know) http://support.microsoft.com/kb/948066

 Only bluray iso's  studder .Its not network based  because  it does it with the iso  local also .The audio stays perfect just the video jerks.Its like it drops a few frames every ten sec or so .After it starts is affect all video play back  even live tv .I have to do a hard reset  to clear it out .

 I have tried three different iso's  all do the same .My Living room media center pc play them perfect no problems ..

My guess would be to take a second disk out of another machine and try running the ISO from a second disk and not the one your OS is running from.

Fleadh:

My guess would be to take a second disk out of another machine and try running the ISO from a second disk and not the one your OS is running from.

 To try this theory, you can probably copy the ISO to an external drive, connect to your machine and see if you can play it without a problem. Thought reading through the post again, it is probably not the issue. You mentioned that you can play back successfully from your BD-ROM drive. Does it work all the time, even when the ISO is failing? Is this the same ISO that works on your other machine?  Would you have a different video card you could try in this machine? May also be some TMT setting that needs to be adjusted.

An external drive would not suffice for the test I was proposing.

  The three blurays i have saved to an iso all work on my living room MC.I dont have another card  to try  but the mother board does have onboard video  it a 8200 geforce.I doesn't matter if i use  onboard or  card i get the studder when trying  to play a vitual iso mounted . I am not sure what you mean about  trying a second drive from another os .These are not actual disk they are iso images ..Thanks  for all the input ..

The idea behind using a 2nd drive would be to eliminate the possibility of hard drive failure.  The ISO is stored on your hard drive, and perhaps their is an issue reading a file that big from the hard drive.  Perhaps the data is scattered out all across the drive, and so you HDD needle is wandering all over the place trying to keep the video playing, but it gets over-burdened.

As for the video card idea, that's no good.  If it was the video card, you'd have the same problem when playing from an actual blu-ray disk.  It wouldn't be limited to just ISO files.