I am having a specific problem with one dynamic cloth prop. The prop is from the M4Yagyu cloth set from the PoserClub site. I am trying to use the pants, it has constraing groups on the waist and the cuffs just below the knees. When I just drape the pants they function fine. When I try to apply a pose to M4 a few frames in the lower pants blow offf the legs Like in the picture. I am usins poserpro2010 on Windows 7. Any suggestions on  a solution or a link to a previous answer would be apreciated.

When you load the pants into the scene, do they fit the figure in zero pose perfectly?  In what frame did you apply the pose?  You need to give poser at least 20 frames to work with.  So your pose should be applyed at the 20th or so frame.  Here is a tutorial I wrote.  Scroll down to the "Running Future Simulations" section and follow the steps.  Your figure went into the final pose too early.  I think that's the problem.

cloth sim in Poser to Poser 7 defaults to 30 frames. Allow some frames to let the cloth settle, so generally zero pose at frame 0 and final pose around frame 20-25. If the cloth is still moving at frame 30 either increase steps per frame or use more frames.

The pants don't load on mike correctly. The person who created the outfit, has the pants load in the spread position.

is it a prop or a conforming figure?

If its conforming make sure not to conform it. I find this causes alot of oddities. If you need to start the draping from a specific pose, pose the character with the pants conforming, and then export the pants to and OBJ file. re-import unticking every option and the pants will pop right back into the correct place for you. then drape that object.

Also, if the object has morph dials that you are using (ie not 0) then this can cause funkiness unless you ZERO all morphs in frame 2 (assuming you are starting at frame 1).
At the start of the dynamics calculation it takes a "snapshot" of the model, which includes morphs. but once the calculation is complete, Poser will then apply the morphs to the draped cloth, depending on how it draped, this can make things go haywire (or just crash poser)

If your having problems getting them to fit properly, use the figure morphs to make him thinner than you want at frame 1. then at say frame 5, reset the morphs and beef him up again.  I use this ALL THE TIME with V4 to make sure things fit properly no matter which female figure they are for.