foamToVTK writes to undecomposed case
Steps to reproduce
On any case:
decomposePar
cd processor0
foamToVTK
this will create ../VTK since it uses the globalPath but does not check for parallel running.
Possible fixes
const fileName outputDir(runTime.globalPath()/vtkDirName);
should check for Pstream::parRun() and use runTime.path() if not parallel