Description

I've seen this happen in other areas of the editor as well: Data Table fields (floats) for example.

Manually typing in numbers to fields seems less prone to this error; using spinners to drag values reproduces the error more reliably

Sometimes a restart of the editor fixes it.

Steps to Reproduce

Using attached project:
-Open project in Editor
-Open .../Content/UI/LoadingScreen_Widget
-Select "Loading" Image Widget
-From Details Panel ->Appearance ->Color and Opacity, click the swatch to open the Color Picker.
-Use Eyedropper to click light blue color of Border Widget
-Attempt to PIE

RESULT:
Warning is thrown: "Can't Play In Editor when performing Edit Color and Opacity operation"

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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-33580 in the post.

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Fixed
ComponentTools
Affects Versions4.12.54.13
Target Fix4.13
Fix Commit3073896
Main Commit3092051
Release Commit3073896
CreatedJul 20, 2016
ResolvedAug 2, 2016
UpdatedOct 23, 2020
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