Pop Transports do not work correctly in 1.66

True.

The best way I found to work around that is:
Create a pop transport that has a smallish cargo.
Use the Load cargo remotely (population from a full planet)
Use the Drop cargo remotely (population to an empty planet)
Toggle the repeat orders ON.

If the ship has too much cargo space you can depopulate the source planet.

If the ship doesn't have enough cargo space or the planet is too distant (takes to long for a round trip)you might not move population faster then they migrate back.

You will get a message if the source planet is empty (1M pop) or the destination planet is full.

How are they supposed to work? I've always done it manually (like Jozsf described), and when the target planet is full enough or the source planet is getting too low, manually move on to the next one.

Are you talking about some sort of minister?

Yes, there is a pop-transport minister who distributes population from full planets to other planets. works fine as long as you have only one kind of atmosphere breathers.
It gets confused if there are different breathers.
Its like enhanced migration, by hand the people get where you want them.

Remember : Pillage! then burn.
- Cpt. Kaff Tagon

I've also accidentally depopulated planets by building and using colony ships. A max pop check and a way to automatically load less than a maximum number would be a great idea.

May as well get rid of ministers. I never use them anyway.

I sometimes use the scout minister and, to be honest, I love the colony-population minister. You know, the one where it ejects 50m of your own pop so 5m of the right air breathers can undome a planet? I love that, so convenient. He's ruthless and efficient and does his job well, heh. Also, the colonizer minister can be convenient at times but thats situational really.

All the rest? Yeah, never use them.

Good to know about the colony-pop minister

I hate to do that for myself .. I always feel so sorry for my fellow kinsmen.

Does he message you ( planet xy has been undomed or 50m people have been .. evacuated ) or do you have to find out for yourself ( ooh looky, since when have you little fella been undomed ? )

I like the scout minister too, especially combined with the resupply and retrofit minister Those really work well together.

Remember : Pillage! then burn.
- Cpt. Kaff Tagon

It doesn't specifically tell you but in the turn report it will say "Such and such planet ejected cargo" or something similar. Just doubleclick on those and it will take you to the planet which should be undomed and ready for more facilities to be built.

Millions of your own race = cargo.

edit- btw, that minister is only in BM, as far as I know.

Yes, the "Colonies - Population" minister is only in the Balance Mod. If you see a log message from scrapped cargo with only organics recovered, that's him at work.

Space Empires Depot | SE:V Balance Mod

I play organic races most of the time I will call it recycling

Remember : Pillage! then burn.
- Cpt. Kaff Tagon

Using the POP minister in BM works well. It keeps my homweorld just below max and seems to evenly distribute pop around my colonies. I check out the POP levels every few turns just to make sure.
Love those custom views. On my Colony window, I have the normal stuff plus POP level, cargo tonnage, workqueue, and planet condition.