---
title: How can I fix synchronization issues between MFLink and FSUIPC/XPUIPC?
description: "If your flight will not start because MFLink cannot synchronize with FSUIPC, check these two settings. **Flying X-Plane?** Check your XPUIPC version first: see [MFLink stays stuck on \"Synchronization in progress\" or \"Boarding\" with X-Plane](https://metaflight.aero/docs/mflink-stuck-synchronization-boarding-x-plane/). ### Step 1: Set FSUIPC…"
url: "https://metaflight.aero/docs/how-can-i-fix-synchronization-issues-between-mflink-and-fsuipc-xpuipc-2/"
updated: "2026-10-21"
category: TROUBLESHOOT
---

# How can I fix synchronization issues between MFLink and FSUIPC/XPUIPC?

If your flight will not start because MFLink cannot synchronize with FSUIPC, check these two settings.

**Flying X-Plane?** Check your XPUIPC version first: see [MFLink stays stuck on "Synchronization in progress" or "Boarding" with X-Plane](https://metaflight.aero/docs/mflink-stuck-synchronization-boarding-x-plane/).

### Step 1: Set FSUIPC to High priority

1. Press **Ctrl + Shift + Esc** to open the Task Manager.
2. Open the **Details** tab.
3. Right-click **FSUIPC**, then **Set priority > High**.
4. Leave **MFLink** at its normal priority.

Windows resets this priority each time FSUIPC restarts, so repeat it if needed.

### Step 2: Do not run FSUIPC as administrator

1. Open the FSUIPC installation folder.
2. Right-click the FSUIPC executable, then **Properties > Compatibility**.
3. Click **Change settings for all users** if available.
4. Untick **Run this program as an administrator**, then click **Apply**.

MFLink must also run in normal mode, not as administrator. Restart both, then launch your flight.

Still not synchronizing? [Open a support ticket](https://metaflight.aero/docs/how-do-i-open-a-support-ticket/).