[Freesurfer] bedpost failure using tracula

Hi, After I run step 2 of tracula (>trac-all -c config_DTI_B.txt -bedp), I am missing multiple bedpost output files (e.g., mergedph1samples.nii). Examining the output, it looks like data from only one slice was written (dmri.bedpostX/diff_slices/data_slice_0002). This issue has replicated across multiple subjects. I'm processing data locally on mac os 10.6.8 (16 GB RAM; two 3.2 quadcore processors, which should be able to handle bedpost), using FSL 4.1.9. I don't see any errors in the tracula log files (until I run -path), and no complaints in the terminal window (which writes: Queuing parallel processing stage 0 slices processed 1 slices processed 1 slices processed etc...

Any insight as to what might be causing the issue?

Thanks, Scott