I have also discovered when I trade the same EAs on Oanda demo account and the Oanda live account I get different results such that my EAs win on the Oanda demo account and lose of the Oanda live account. So even when I live trade with Oanda I demo test on the live account as well.
Currently I am demo testing the FTMO v5.1 robots on the FTMO demo account. So, once I start trading these robots on a challenge I will be able to see if there is a significant change between the demo account and the challenge account. I will not be starting a challenge until after the first of the new year.
Alan,