I was able to reproduce the "freeze". There was a save file made at Cycle 613 - this was after the crude oil had started flowing but before anything else had happened.
This is my first "bug report" and since I skipped a few steps in the initial creation, I'll need some directions on how to send you the Cycle 613 save file(s).
Save file is now included. Not thinking, I started a new game yesterday after making sure the I had a good save file - sorry!
Again and Again.sav