Eclipse 2025-06: UI rendering issues on Windows with monitors using different scale factors

When running Eclipse IDE for Enterprise Java and Web Developers (2025-06 release) on Windows 11, UI rendering artifacts appear on secondary monitors configured with a different scale factor (e.g., 125%). Some images/icons display with black boxes or incorrect rendering.

[Run -> Run Configuration]

Environment:

Eclipse IDE 2025-06 (tested also with Eclipse 2025-09 RC2)
Windows 11
Multi-monitor setup with different scale factors (e.g., primary monitor 100%, secondary monitor 125%)

Steps to Reproduce:

Launch Eclipse 2025-06 on Windows 11.
Use a dual-monitor setup where one monitor is set to 100% scaling and another is set to 125%.
Open the IDE on the secondary monitor (with 125% scaling).
Observe UI elements and icons.

Expected Behavior:
Icons and images should render normally, without artifacts, regardless of monitor scale factor.

Actual Behavior:
Some images/icons display with black boxes or rendering glitches on the monitor with a non-100% scale factor.

Additional Notes:

Issue is reproduced only in Windows OS
Issue occurs even when “Monitor-specific UI Scaling” is enabled in Eclipse Preferences.
Tried Windows compatibility settings → Override high DPI scaling behavior → System (Enhanced), but the issue persists.
Issue is not reproduced when both monitors use 100% scaling.
Verified with latest Eclipse 2025-09 RC2; the issue still exists.

I have tried to reproduce the behavior with the 2025-06 release of the package for Enterprise Java and Web Developers. I use primary monitor at 100% and secondary monitor at 125%. I have started the application from both primary and secondary monitor and opened the Run Configurations dialog on the 125% monitor or moved it there. In all cases the icon backgrounds look correct for me:

Can you give information about the JRE you are using to run Eclipse? In my case, it's Temurin 21.0.6.7. Maybe you can also try to start Eclipse with a different JRE build or version.

Tried Windows compatibility settings → Override high DPI scaling behavior → System (Enhanced), but the issue persists.

Settings DPI awareness for the process will not have any (relevant) effect as when "monitor-specific UI scaling" is enabled the application overwrites proper DPI awareness for the UI thread.

@HeikoKlare

@HeikoKlare thanks for getting back to me.

I first tried with inbuilt JRE to launch Eclipse (OpenJDK21). Now tried with Temurin21 and still the issue persist.

I will re-write the exact steps with screenshots for better clarity

Screen 1

Screen 2

Launch eclipse in 125% screen [screen1]
Open Run -> Run Configuration Window
Observe no UI issues

Drag and Drop the Run Configuration Window to 100% screen [screen2]
Observe no UI issues

Drag and Drop the Run Configuration Window again to 125% screen [screen1]
Observe UI issues

I have tried with few other Windows machines and observation is the same.
Appreciate your support to resolve this issue.

I have observed this in the past, but I changed the JDK I was using and did updates and it seemed to go away. But today I see it in my SimRel IDE in by 125% monitor:

But it's this version:

Configured with:

C:/Program Files/Java/jdk-21.0.2+13/bin

That JDK I had configured like this because in the past that worked reasonably well:

Just now I changed the eclipse.ini to

C:\Program Files\Java\jdk-21.0.8+9\bin

And now it works fine:

So at least for me the problem depends on the settings on the java.exe/javaw.exe of the JDK/JRE that that runs the IDE.

@merks

Thanks @merks for your comments

Investigated further and found that for me the issue exists regardless of the JRE used to launch Eclipse.
When the “Use Monitor-Specific UI Scaling” option (which is enabled by default starting with Eclipse 2025-06) is disabled, the above UI issue is not re-created

Release note with new feature : Eclipse 2025-06 Release Note – Monitor-specific UI scaling as default (Windows only)

@WinmaH

Thank you for the detailled explanation. I was now able to reproduce the issue. It's somehow not deterministic but it happened to me in at least 50% of the executions of the described flow. Here is exactly what I did (conforms to the description ot @WinmaH):

Have two monitors, 125% secondary to the left and 100% primary to the right
Start an Eclipse IDE for Java and Web Developers (e.g. 2025-06 or 2025-09 RC1) from the secondary monitor; this means you can, e.g., navigate to the eclipse.exe in a Windows explorer that is placed on the secondary monitor
Start the "Run Configurations" dialog, move it to the primary monitor and move it back to the secondary monitor:

@HeikoKlare

Thanks @HeikoKlare for getting back.
As per my last comment if we disable the monitor specific ui scaling option in the preferences the issue disappears.

As per my last comment if we disable the monitor specific ui scaling option in the preferences the issue disappears.

Yes, that's kind of expected. Without monitor-specific scaling the UI does not scale at all, so images will also not be rescaled.

For what it's worth, one might skip scaling on a 125% monitor and get by, but skipping it for a 200% monitor would quickly require a trip to the optimist. 👓 🔍 This is why in the past I configured JRE the way that I did. The current behavior is really quite nice other than these weird gif transparency problem...

Moving this issue to SWT as the cause is very likely somwhere in the scaling of images.

I am able to reproduce the issue with simple gif image with this concrete snippet: (Primary: 100, Secondary: 125). Background is lost when moving to 100 -> 125 and back.

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;


public class ButtonWithGifImage {
    public static void main(String[] args) {
    	System.setProperty("swt.autoScale.updateOnRuntime", "true");
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("SWT Button with GIF Image");
        shell.setSize(300, 200);

        Button button = new Button(shell, SWT.PUSH);
        button.setBounds(80, 60, 140, 60);
        button.setText("Click Me");

        Image image = new Image(display,
            ButtonWithGifImage.class.getResourceAsStream("sample.gif"));
        button.setImage(image);

        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }

        image.dispose();
        display.dispose();
    }
}

After moving back and forth, the result:

[win32] Move transparent pixel handling from Image to ImageHandle

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Eclipse 2025-06: UI rendering issues on Windows with monitors using different scale factors #2494

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Eclipse 2025-06: UI rendering issues on Windows with monitors using different scale factors #2494

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HeikoKlare commented on Sep 8, 2025

WinmaH commented on Sep 9, 2025

merks commented on Sep 9, 2025

WinmaH commented on Sep 9, 2025

HeikoKlare commented on Sep 9, 2025

WinmaH commented on Sep 9, 2025

HeikoKlare commented on Sep 9, 2025

merks commented on Sep 9, 2025

HeikoKlare commented on Sep 9, 2025

ShahzaibIbrahim commented on Oct 7, 2025

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