Reported on the dev forum, drag-drop widget is broken in the 5.1 Preview.

Anyone else having problems with UUserWidget::SetPositionInViewport()?
With 5.0.3 my drag-drop widgets (based on the official tutorial Creating Drag and Drop UI | Unreal Engine Documentation 1 ) worked perfectly fine, now they are all stuck at position

Unknown macro: {0,0}

(top left) and SetPositionInViewport() does not change anything, despite getting the correct position input values.

It seems they added a new subsystem for handling widgets (UGameViewportSubsystem), perhaps it’s not working correctly yet?

Steps to Reproduce
  1. Using the 5.1 preview, drag and drop a widget to the canvas.

Result: The widget is stuck at position (0, 0).

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ComponentUE - Editor - UI Systems - UMG
Affects Versions5.1
Target Fix5.1.1
Fix Commit23227808
Release Commit23227752
CreatedNov 7, 2022
ResolvedNov 23, 2022
UpdatedDec 3, 2022