I cannot get immigration working in Hidden Springs.

I use NRaas Immigration Gauge and most worlds seem decent with a setting of 1 (0 is none, 2 seems to require massive demand before anyone new is admitted). Sunlit Tides uses 1 for a couple of days then back to 0 before the council starts complaining of lack of housing (I built a dozen or so new houses, from two room hovels to six bedroom mansions, all were occupied in a couple of days and the council was still complaining).

But on Hidden Springs a setting of 2 produces endless messages about not enough pressure to allow immigration, while a setting of 1 produces these two messages alternating every 10-15 minutes -






What does it want me to do?