Hopefully I search didn't miss a similar topic already posted...

Somewhere around turn 160 in my game it stopped allowing me to build in my level 4 city, with all buildings greyed out due to tile requirements (even tile requirements of 1).  There are two or three empty tiles that may be gardens (wherever I built them originally, they disappeared), however I cannot build on these.  I am also unable to destroy buildings, as I receive a message that it will make my city non-contiguous (have tried on every building in my city, even a watch tower).

I've tried building another city and advancing another 40-50 turns, however, it doesn't change.  Since I can't build another house to advance the city level, the city effectively seems stuck.  The strangest part is earlier in the game I remember having tiles available on the outskirts of my city that it no longer shows as available.

-May have lost tiles once I loaded the game from save based on similar reports here:

https://forums.elementalgame.com/386101