Smart IR needs an update from what I here. All changes will be in the change log if anything for IR is changed.
Dev from Smart IR Remote here - we've updated our app ever since the GPE edition of 4.4.3/4 came out. Google changed the way the IR signals are sent, and they did it on a driver level. You / AOKP will need to get the updated drivers from official GPE (not normally included in roms) to get it to work using the new official methods.