Since GBPCAD is getting an Error message saying trade is disabled this normally occurs when the broker will not allow trades to be taken. Since you can manually open trades it leads me to believe your broker does not allow auto-trading. Further since the other two EAs are also not taking trades makes me wonder if they too are getting the trading disabled message. However, if the other two EAs has not been active long enough it could be that the EAs have not yet tried to take a trade. This then makes me wonder if when these two EAs do try to take a trade will they then have their trades disabled by your broker. Right now it is my opinion your broker could be blocking auto trading. I recommend you contact your broker to verify if they allow trading with Expert Advisors.
Alan,