I came home from work today to find a slight problem with my trading spreadsheet.
I bet the greyhounds and today the trading spreadsheet was working fine, in fact 28 races had passed and I was showing a profit.
THEN in the race at Swindon | 24/08/2007 | 16:08 | Grade A3 | 480m it layed one selection at the correct stake but on another it layed it at approx 55x more stake than it should have at odds of 8.2
, and guess what the selection WON. My stake is worked out from my current balance, I can only assume the balance some how displayed incorrectly. I have been chasing to recover my considerable loss with a beer or two, and thankfully I have just managed to achieve that..PHEW!!! 
Luckily I have a trigger to stop betting after my current bank reaches 90% of my starting bank for the day, and that kicked in suspending further bets. I have now added some extra security triggers to stop a similar occurrence. If anyone was betting via excel during that particular race and noticed something not quite right, please let me know, as I'm completely baffled!!
All reset and seems to be working fine now.
Cheers
Castillo