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MT4 arrested when I change timeframe of my expert

Hello, I have to connect my EA to a remote database using library LibmySQL.dll and mql4-mysql.mqh, but, when i change timeframe on the chart with the EA, my MT4 platform stop working. Does anyone know how to solve it? or ever encountered this problem

Efficient Trading System

Good afternoon, could anyone recommend me where I find en efficient trading system, or a platform that provides graphic proof of the efficiency. Any suggestions? I generally operate intraday or with short to medium time trades. Thank you