Are you entering it as an array? Try

=INDEX(EBITDA_Forecasted!$FP$5:$IU$5,MATCH(1,--(EBITDA_Forecasted!$FP7:$IU7>0),0))

---------- Post added at 03:04 PM ---------- Previous post was at 03:03 PM ----------

What sort of values do you have in EBITDA_Forecasted!$FP7:$IU7 ?