I made a test map that worked, but now in my real map, it's not working. A couple of ideas I thought it could be, an order trigger on the carrier or a vision on/off thing, but I don't have anything like that firing.
Any ideas guys?
None.
solved now, i was doing an immobilize for all units. Set it to immobilize all units BUT the defilier and it works perfectly. Cheers 
IskatuMesk -- u guys ever look at the "Backend performance improvements" line and kinda you know 👀
Oh_Man -- makes me wonder tho, a brood war achievement project culd be quite something, following the design methodology of SC2 achieves
Oh_Man -- intresting concept, i see starcraft N64 is on there, most of the achieves seen bare bones though
l)ark_ssj9kevin