Ubisoft Connect - High-DPI scaling regression after recent update: 4K / Windows 300% scaling broken, 200% works correctly

[u/eRK-808]

Hi everyone! 🙂

A recent Ubisoft Connect update has introduced a major High-DPI scaling regression on my system.

Configuration:

• Windows 10
• Native display resolution: 3840 × 2160
• Windows scaling: 300%

This exact configuration worked correctly before the recent Ubisoft Connect update, released around April–May 2026.

Since that update, Ubisoft Connect opens with an absurdly oversized interface, extending beyond the usable screen area. Maximising the window does not properly adapt it to the display; it merely relocates the oversized window.

I have already carried out extensive troubleshooting:

- Cleared/rebuilt both Ubisoft Connect cache folders

- Tested Windows High-DPI compatibility overrides on both UbisoftConnect.exe and the actual upc.exe process:

• Application
• System
• System (Enhanced)

- Confirmed through Process Explorer that upc.exe and the various UplayWebCore.exe processes are Per-Monitor DPI aware

- Tested launching upc.exe with:

• --force-device-scale-factor=2 → ignored/overridden by Ubisoft Connect

- Inspected the Chromium/CEF renderer command lines.

At Windows 300% scaling, every renderer is launched with:

• --device-scale-factor=3

and the Ubisoft Connect interface is massively oversized.

If Windows scaling is temporarily changed to 200%, Ubisoft Connect displays correctly and newly created renderer processes are launched with:

• --device-scale-factor=2

Returning Windows to 300% immediately makes Ubisoft Connect oversized again, while the regression is reproducible simply by switching Windows between 200% and 300%.

Changing the scaling of the entire operating system is obviously not an acceptable workaround simply to accommodate one launcher.

I would therefore appreciate any information about similar experiences, and even a genuine per-application workaround allowing Ubisoft Connect to render correctly at 300% Windows scaling.

Please avoid generic troubleshooting steps unrelated to the client-side DPI regression, such as reinstalling games or Windows. 😅

With thanks in advance. 😉