save on carrier pop, should happen almost instantly, twice.
Ok, just loaded that up and the two on Murdoch do pop quite quickly, but they're spawning units. For some reason the units don't seem to spawn next to the carrier itself but not all that far away.
Because the AI population is already pretty high on that planet it converted the two 1000-mkIII-chameleon carriers into a total of:
73 MkV Chameleon
23 MkV Flak Guardians
7 MkV Artillery Guardians
10 MkV Beam Guardians
7 MkV Lightning Guardians
Translation: Ow
Do they really not spawn anything when you try it? To check, see if you wind up with any mkV chameleons under the planetary summary, or mkV guardians in general.