Stam,
Thanks for your response.
I am running FSL v5.0.4 from a linux cluster (64bit, RedHat CentOS release 5.4).
bedpostx_datacheck shows that I have the necessary files:
./data
data_type INT16
dim1 128
dim2 104
dim3 64
dim4 65
datatype 4
pixdim1 2.0000000000
pixdim2 2.0000000000
pixdim3 2.0000000000
pixdim4 1.0000000000
cal_max 0.0000
cal_min 0.0000
file_type NIFTI-1+
./nodif_brain_mask
data_type INT16
dim1 128
dim2 104
dim3 64
dim4 1
datatype 4
pixdim1 2.0000000000
pixdim2 2.0000000000
pixdim3 2.0000000000
pixdim4 1.0000000000
cal_max 0.0000
cal_min 0.0000
file_type NIFTI-1+
num lines in ./bvals
1
num words in ./bvals
65
num lines in ./bvecs
3
num words in ./bvecs
195
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