I have been using FS5.0 and just started using 5.1. I tried running a recon with the new version with two of my subjects, and in both cases I got the same error message:

IFLAG= -1  LINE SEARCH FAILED. SEE DOCUMENTATION OF ROUTINE MCSRCH ERROR RETURN OF LINE SEARCH: INFO= 3 POSSIBLE CAUSES: FUN
CTION OR GRADIENT ARE INCORRECT OR INCORRECT TOLERANCESoutof QuasiNewtonEMA: 008: -log(p) = 7003.6  tol 0.000010

This error did not stop the rest of the recon from running for quite some time after the error, however, it ultimately exited with errors. I searched the mail archive and found reference to this error message, but I couldn't identify how it was resolved/what the cause of it might be. Any suggestions as to what might be causing this? 

Thanks,

~Sue