I noticed my gold amount crashed without warning and discovered that accepting the House tech was the culprit. Huts immediately became houses (as intended by the Devs). That's a nice feature but the cost can be quite substantial -- 1000 gold in this case. I had 20 completed houses, 8 more being built, the listed house cost is 50, so it's automatically deducting 50 gold per completed house.
I'm not sure what the best answer is, but going from +149 gold to -851 can be problematic 