Tradepost building: Starts to build, then disappears

[The_Hobbes]

Playing as a merchant of Venice (heh). Found a province with no tradepost showing. Square is green, all pre-requisites are met. I click the box to build, it asks me to confirm and I do.

After that - the tradepost box shows a tradepost with the in-progress building bar starting to fill up, my money is debited...and then suddenly the tradepost disappears! I receive no messages or warnings.

I tried putting every message in the game with "tradepost" in the title as the top message urgency + pause. But it keeps happening. Really confused. What am I missing?

 

[Zsrai]

Was the province being looted by raiders? They destroy TPs when they successfully raid (siege) holdings down.

 

[Chunakun]

Was the province being looted by raiders? They destroy TPs when they successfully raid (siege) holdings down.

And if it is a tribal province don't bother building trade posts because of this.

 

[The_Hobbes]

They weren't tribal. It was happening in multiple places (East Coast of Italy, Croatia coast, etc). No raiders involved.

I abandoned the game and tried again and have been in similar situations w/o seeing the problem. Totally baffled.