I discovered all 4 new islands with explorers. Bought 4 island deeds and unlocked the new islands. I've built stores on 1, 3 and 4 (numbered in the order explorer discovered them). I can't build a store (normal/island/improved) on the second island (top right).
I have logged off, removed cookies and cache as detailed here https://forum.thesettlersonline.com/...l=1#post331603 and waited 15+ minutes, still can't build there. The island deed hasn't returned to my star menu either.