Sounds like this known problem with lagrangian data in openfoam.org version.
- could use a different version (eg, OpenFOAM-v2006), which should be the same for your type of calculations.
- could use the vtkCloud function object from openfoam.com, and attempt to port it to openfoam.org
- foamToVTK to convert from OpenFOAM to VTK format
- foamToEnsight to convert from OpenFOAM to EnSight format and then process that in ParaView.