had same problem, wiring ok, separate elec supply.
solution was to import the Libraries
from menu ( sketch ? in french Croquis), include library, import a zip , take it from CD
then libraries again, find the new imported library
#include <Stepper.h>
#include <IRremote.h>
#include <IRremoteInt.h>
in my case was missing the last one.
works ok now...
good luck you who enters here, there is still hope!