Hi hi
Personnally I don't worry whether yellow or green, however from my own experiences, I have found it will change after approx 4 or 5 games stroke play.
This last week or 2 has been the worst for players being thrown out of a game for no reason other than WGT system not able to cope. I'm sure most are aware of these problems except WGT lol!!!!!
Good luck in your games, and have fun regardless of the errors from WGT, it will improve in time. >^_^<