Could you give a bit more code?  Also, how are you rendering the meshes?
  
  
Structure:  
----------  
Structure CustomMeshX  
    Public Mesh as Direct3D.Mesh  
    Public numX as integer  
    Public Tex() as Direct3D.Texture  
    Public Mat() as Direct3D.Material  
End Structure  
  
Form Load procedure:  
---------------------  
Form1.Show  
  
Initialise Direct3D  
  
Dim mMesh as CustomMeshX  
  
While Me.Created  
  
d3ddevice.beginscene()  
For i = 0 to mMesh.numX  
d3ddevice.settexture(0, mMesh.Tex(i))  
d3ddevice.material = mMesh.mat(i)  
mMesh.Mesh.drawsubset(i)  
Next i  
d3ddevice.endscene()  
d3ddevice.present()  
  
application.doevents  
  
Wend