Problems with meshes in Kangaroo2

Hi,

I am trying to simulate inflation of some surfaces which I have converted into meshes from surfaces using various meshing techniques. 

- meshing a brep using the Karamba 'Mesh from Breps' component

- meshing a surface using the Mesh Surface component

I have had varying success with the meshes with the 'Mesh from Breps' component however there are some meshes which just don't seem to work properly - they somehow deform weirdly and never converge.

The meshes from Mesh Surface usually give an error when I load them in. See image below. The error message is in german but it basically means 'At least one error has occurred'. Sometimes when I explode the mesh and load it back in, it works sometimes. 

Does anyone have any ideas on why some meshes work and some do not? I have many surfaces that need simulating and it would be great to find out the reason for this. I am currently using version 2.1.2.

Thank you

Matthew