[Freesurfer] selxavg3-sess on OSX

I'm running v5.0 on 10.6.4. When I run selxavg3-sess, I get the following error:

ERROR: cannot determine format of

/Users/jwebst/UW/Psych/VisCog/projects/vAttPRF/data/vAttPilot01/bold/003/masks/brain.nii.self.lh ERROR: cannot load /Users/jwebst/UW/Psych/VisCog/projects/vAttPRF/data/vAttPilot01/bold/003/masks/brain.nii.self.lh

I'm not familiar with the creation of the maskfspec field or of flacfiles generally. Is it the case that there is a flacfile for each analysis (so the correct mask is brain.self.lh.nii)? ...or should it be loading brain.nii and '.self.lh' was erroneously appended?

Also, one tangential issue worth mentioning for the release August 16 release for Intel OSX... it seemed to be missing 3dvolreg.

~Jason