I had an issue where the last steel mill in my triangle wouldn't finish building and would disappear. I rebuilt my steel mill 5 different times and every time it would get to about 55% and then stop building and credit me the iron. Rinse repeat.
I asked other people to watch it from their perspective and they could see my steel mill build and then stop building suddenly. Same thing happened when i tried to build a farm. After a little bit another player had a problem where they couldn't build a patent lab no matter how how many times they restarted it.
Let me know what info you guys need and where to send it. I saved both the log and replay.