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I'm at the base trying to get a victory with the type B Rock ship, but the mothership is up in the right corner just jumping between 2 points ... not going towards the base. I waited like 10 times and it just keeps doing it.

Not very happy about this.

While at the base, I also get the message about the mothership only needing to stay there for three turns ... but I'm there, it's not.

Could you upload the save so we can take a look?