Yes its a know problem with Apolyton pack.
But its easy to fix, just 'sleep' your settler before you end your turn. When you want to move it unsleep it and you will have control.
As soon as you build your second city with it the problem goes away never to return
If you need more detail its in the FAQ at the top of the other forum(help/gameplay etc)
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'The very basis of the liberal idea – the belief of individual freedom is what causes the chaos' - William Kristol, son of the founder of neo-conservitivism, talking about neo-con ideology and its agenda for you.
info here. prove me wrong.
Bush's Republican=Neo-con for all intent and purpose. be afraid.