Many Trading Problems Are a Lack of Knowledge
Some of the "problems" we get are on par with asking a scientist to create fire that isn't hot. Fire is hot by nature. You can't do anything about it.
It's important to understand your trading strategy and how it fits in with the forex market structure. You must do so in order to differentiate between what is really a problem versus what is an inherent characteristic of the strategy and trading.
My Expert Advisor Buys and Sells on the Wrong Prices
The most common report complains about Expert Advisors buying on the wrong price. Many traders overlook basic trading facts when designing a strategy. Just because a chart shows a series of prices does not mean that you can actually trade those prices. All financial charts display the bid. It's market convention.
When an EA places a buy order, especially on low time frames where the spread exercises a greater impact on trading outcomes, the entry arrow appears impossibly high above the price. This does not represent a flaw or error in the EA or with the broker. It represents a misunderstanding on the part of the trader. You can only buy on ask and sell on the bid.
There is no way to trade immediately and dictate which price you want. If you'd like to set the market price, then perhaps running a strategy as a price maker on a true ECN would be more appropriate. The disadvantage to doing so is that another trader must come along and actually take the other side of the trade.
My Martingale System Has High Drawdowns
No kidding. That's the whole point of running a Martingale system. You're potentially betting the farm on each trade in exchange for the very small likelihood that you will lose everything.
The high drawdown complaint emerges after a few hundred or possibly a thousand trades. It then becomes obvious that if you trade long enough, even a small probability event will pop up every once in a while. There is nothing that you can do about this. You are trading a low probability, highly impactful strategy in terms of negative risk. You win most of the time, but when you lose, it tends to be catastrophic.
Nobody can turn high risk into low risk. Just ask the quants that created the CDO mess. It does not matter how much financial wizardry that one can draw upon. Subprime loans do not magically convert into genuine AAA bonds, no matter how much mathematical twisting goes on behind the scenes. Lead will always come out lead on the other side. Gold will always come out gold.