affine minctracc registration segfaults if -transformation argument contains a gridfile

[bcdarwin]

(Understandable that registration doesn't proceed, but an error message would of course be nicer for debugging.)

[bcdarwin]

  using input transformation to get initial parameters:
   Center of rot/scale not forced, will be set to : 0.000000 0.000000 0.000000
AFTER init_params()

Transform center   =    0.000    0.000    0.000
Transform rotations  =    0.032   -0.032   -0.008
Transform trans    =   -0.023    0.029    0.129
Transform scale    =    0.987    1.014    0.931
Transform shear    =    0.003   -0.005   -0.026

In set_up_lattice, xyzv[axes] = 2, 1, 0, -1
slice lim 1 8
row lim   2 17
col lim   1 12
thresh =    0.00000    0.00000
In set_up_lattice, xyzv[axes] = 2, 1, 0, -1
Source volume is smallest
Lattice step size  =    0.900    0.900    0.900
Lattice start      =   -4.940   -5.850   -3.000
Lattice count      =       12       16        8

/axiom2/projects/software/arch/linux-xenial-xerus/src/minc-toolkit-v2/libminc/volume_io/Prog_utils/print.c:249 (from miicv_free): volume_io error: Internal error:  %s
Segmentation fault (core dumped)

[gdevenyi]

Hi @bcdarwin can you add -debug to your minctracc call (and provide the exact call?) to assist here. Thanks.