The wrong location of signcode.exe breaks digital signing for RE build on windows-i586 platform. On RE build machine, only the standalone version of InstallShield 8.02 is installed, so the following pathname does not exist:

C:/Progra~1/Installshield/StandaloneBuild8SP2/System/signcode.exe

Also this is another problem, I noticed 2 signing tasks succeeded in the build process because they used a different signcode.exe from InstallShield Package for the Web:

C:/Progra~1/InstallShield/Packag~1/signcode

Please see the complete log for the signing process in the attachement.