[Ygorl]

I've had no problems playing on a (graphicless) server computer by starting another instance, choosing "Network", and putting in the address 127.0.0.1 (the local machine).

If you've done your turn as you describe, I guess that the server will not become aware of your having done so, but I also bet that if the server hosts it will properly process your turn (as the file is there, already).