I have recently noticed that I was 1 gold less then I was the day before. My preferences are set to always ask me before using gold. I just couldn't figure out when I had spent it until recently. I was watching the clock on a recruit and pressed the "button" for it to be a free recruit immediately when it should have turned to free (at the 4 min 59 second mark), instead it consumed a gold without asking me. I am using an ipad. I am not going to try and replicate it.