are you sure your not placing it on a op or colony?
someone said the same but ops instead.
are you building on sea? it ussaly has just a green circle when in sea
log out then x out the internet/firefox lots more} then select google and try again
what adobe flash have you got because you need 11.1 to play BD
if your on the edge of land it comes up green but when you click, it says "cannot build on water"
If it still dosent work the reset the computer and try again.
if you have this, run -CCleaner it will clear all cookies, cache, history when finished you click what programs or things you can deliet because it is known as *crap thats why its called crapcleaner
i hope i helped