I always thought that extra hammers being saved for the next construction was a feature. It seemed like something too basic to be a bug, esp. with the patch. I never got into MP with MOO2, so maybe that's why I didn't realize about the bug.
hammers saving per ser is not a bug, the bug is extra free money that you get from the saved hammers.
It was fixed in Mac Version.
__________________
It is forbidden to kill; therefore all murderers are punished unless they kill in large numbers and to the sound of trumpets. - Voltaire