[Freesurfer] FW: error messages in skull strip

Hi, I have been running subjects in Version 5, and notice there are consistently weird error messages in the skull strip section of recon-all.log. These look like:

IFLAG= -1 LINE SEARCH FAILED. SEE DOCUMENTATION OF ROUTINE MCSRCH ERROR RETURN OF LINE SEARCH: INFO= 3 POSSIBLE CAUSES: FUNCTION OR GRADIENT ARE INCORRECT OR INCORRECT TOLERANCESoutof QuasiNewtonEMA: 006: -log(p) = 10319.2 tol 0.000010

Despite the log containing a few of these warnings, recon-all itself almost always completes “without errors, ” and the subjects appear to be fully processed. However, I have noticed a greater prevalence of bad skull strips compared to version 4.5.

Does anyone know what this error means?

Thanks,

Brad Zoltick and Aaron Goldman