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MT5 Build 5505 – Optimization fails on Custom Symbols - ticks send error / history synchronization interrupted

Hello I am experiencing a problem in MT5 Build 5505 after the update on 16 Jan 2026. The issue occurs **only with optimization of EAs on custom symbols**. Here are the details: 1. **MT5 Build:** 5505 2. **Problem:** Optimization stops with errors: - "ticks send error" - "ticks synchronization