Error code 127 means that the command wasn't found. This line was in the log stderr.txt: /bin/sh: mBackground: command not found So….do you have all the Montage binaries in your path? What happens when you say mBackground in the terminal? On Jan 24, 2012, at 1:37 PM, Emalayan Vairavanathan wrote: > <SwiftMontage-20120124-1127-9a0xujy4.log.gz>