MQL5 Market / Лента новостей

Every indicator-based Expert Advisor has to decide which candle it reads: the one that is still forming, or the last one that closed. The same moving-average crossover or RSI threshold behaves differently depending on the answer...

The first published schedule Until this year, MT4's end-of-life was a prediction...

A converted Expert Advisor that compiles without a single error is not evidence that the conversion worked. The characteristic MT4 to MT5 failure does not produce anything wrong to find — it produces an absence, something that should have happened and didn't...

A clean recompile is where an MT4-to-MT5 migration starts, not where it ends. The functions rename, the errors clear, the Strategy Tester runs — and four architecture differences sit underneath, none of which throws an error...

If you are migrating from MQL4 or debugging a position management bug you cannot reproduce in Strategy Tester, read this before changing anything else. What the Documentation Actually Says The MQL5 reference for CTrade::PositionClose() is technically accurate. Both overloads are listed...

There is a conversation that repeats often enough to be worth writing down. A trader has traded a setup manually for months, decides to automate it, and frames the project as "turn my rules into an EA." The entry logic gets written in an afternoon...

Every EA project starts with a brief. The brief describes entry conditions, exit logic, position sizing, and timeframe. It is usually thorough on paper. In practice, it is almost never complete...

The Failure Pattern Most EA reliability discussions focus on broker edge cases, slippage, and backtest-to-live gaps. The restart failure is quieter — and it repeats on every restart. The pattern: an EA runs correctly for months on a VPS...

The Problem Picture an EA rescue brief like this: excellent single-trade backtest results, inconsistent live performance during periods when two or more positions run simultaneously. The root cause can be a single function call — AccountBalance() in the lot-size function...

Permission to run an Expert Advisor is not what disqualifies automated prop-firm accounts. Automation permission is not where firms compete — they differentiate on payout splits, drawdown limits, and challenge fees...

The Silent Failure Mode Running two or more expert advisors on the same MetaTrader account exposes a structural gap that single-EA backtesting never reveals. The platform logs no warning when one EA modifies or closes an order it doesn't own...

A PPO agent trained for two million steps on EURUSD 15-minute data with flat reward curves across all five seeds is not an optimizer problem. Switching to SAC will not fix it. Changing the learning rate will not fix it...

DRL algorithm comparisons often headline annualized return. If you plan to deploy the agent on a live MetaTrader account, that is the wrong column to sort on. Here is a benchmark that makes the point concrete...

If you have trained a deep reinforcement learning agent in Python and tried to run it against a live MT5 terminal, you may have seen this: the agent converges cleanly, the backtest Sharpe looks good, and then on a paper account it behaves like it never trained. No error, no warning...

Consider a Phase 1 challenge EA that is disqualified on day 9. The strategy is profitable — positive P&L at the point of disqualification. The journal tells the story: trades are opening after the daily loss limit has already been breached...