Cities won't build?

I see that alot, im guessing that its either not far enough away or there is some other un documented barrier to making another city at that time. Im guessing its more along the lines of it being to close to another city and not noticing giving you the green flag.

I've seen it  (in 1.01.012).  It's SHOULDN'T be because I was too close to a city, because I got this error after getting a too-close-to-city message and moving 1 square farther away.  I thought at first it might be because I didn't have much money, but now I think a bug in the distance calc is more likely.  The other possibility was that the new city would have been near hills & mountains with too few open-land squares nearby.

Okay, so one person gots the problem. Anyone else?

I kept getting a must build on open ground error message once. I moved a few tiles away and it fixed itself but I could later build improvements on those tiles so I'm not sure why I couldn't start a city there.

The button enable and the actual city spawn were using different distance checks (one checked distance to nearest improvement, one to nearest city center). Tonight's build will fix this.

I think there can be a problem if there was a goodie hut on that tile. Last game I couldn't expand my city in such a tile.

btw, is there a way to remove forest? I find it annoying to build my citys arround a forest, mountains can be lowered, but I can't cut down a forest?