I've found another glitch in the vtkPLOT3DReader. When reading Binary Multiblock fortran files, it forgets to skip the ending byte-count after each block's datasections, leading to the data "shifting". The grid code is fine, just the Q-file has this problem.
In my version of the vtkPLOT3DReader (with the optional Function file support), I've fixed it. I attached a new version (sorry Berk) to this email.