Error 1: Negative balance
If you enter a negative balance then leave a negative balance. Once you enter a positive balance the shipyard and planets say project completion dates are NA. The only way to build a ship or complete a planetary construction is to buy outright either the ship or planetary construction.
Error 2: Memory leak
If you start a game then press escape and select the main menu, new game and abandon game in progress. The game suffers a memory leak using more than 8GB at which point windows asks you to shut down game to reclaim memory. I have 12GB onboard memory running windows 7. All drivers are upto date and no other errors for other games.