I'm experiencing this as well on my Mac OS X distribution of FS v5.0.0.  Here is terminal output when running the "Map Label to Subjects" command on the rh, with a rh label in QDEC (below).  Looks like there is a small bug in the code where it points to the left hemi for registration instead of the right ("--hemi lh").  

-Derin

=======================================
mri_label2label --srclabel rh_ifg_test --srcsubject fsaverage --trgsubject C1a --trglabel rh_ifg_test --regmethod surface --hemi lh

srclabel = rh_ifg_test
srcsubject = fsaverage
trgsubject = C1a
trglabel = rh_ifg_test
regmethod = surface

srchemi = lh
trghemi = lh
trgsurface = white
srcsurfreg = sphere.reg
trgsurfreg = sphere.reg
usehash = 1
Use ProjAbs  = 0, 0
Use ProjFrac = 0, 0
DoPaint 0

SUBJECTS_DIR    /Volumes/project/freesurfer/PPA
FREESURFER_HOME /Applications/freesurfer
Loading source label.
Found 7351 points in source label.
Starting surface-based mapping
Reading source registration 
 /Volumes/project/freesurfer/PPA/fsaverage/surf/lh.sphere.reg
Rescaling ...  original radius = 100
Reading target surface 
 /Volumes/project/freesurfer/PPA/C1a/surf/lh.white
Reading target registration 
 /Volumes/project/freesurfer/PPA/C1a/surf/lh.sphere.reg
Rescaling ...  original radius = 100
Building target registration hash (res=16).
Building source registration hash (res=16).
INFO: found  7351 nlabel points
Performing mapping from target back to the source label
=======================================


On Oct 11, 2010, at 9:51 AM, Tessa Harrison wrote:

Hi FreeSurfers, 

I posted this question to the listserv a little over a week ago-- does anyone have any insight as to what is going on with our RH labels?

-Tessa



---------- Forwarded message ----------
From: Tessa Harrison <t-harrison@northwestern.edu>
Date: Thu, Sep 30, 2010 at 9:36 AM
Subject: Mapping labels to the RH on Macs
To: freesurfer@nmr.mgh.harvard.edu


Dear FreeSurfers,

I am running FS 4.5 or FS 5.0 on Mac OS X 10.6.4 -Intel (see attached screenshot).

I am not able to map RH labels created in fsaverage to the RH of any of my subjects. LH labels map to the LH from qdec "Map Label to All Subjects" option and from the command line with no problem. However, when I try to map RH labels (that map correctly to the RH in fsaverage) to individual subjects, the command appears to work (no error messages), but something goes wrong. It appears that the label is actually mapped to the LH because when I pull it up on the RH in an individual subject it looks like scattered dots (see attached image). 

The same thing happens on another Mac in our lab. I have tried both FS 4.5 and 5.0 and the problem occurs in both versions. Could this be a bug in the Mac FS release? I did not find any mention of this problem in the archives. 

Thank you for you help!

-Tessa

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