When shift-dragging in the Blueprint graph and ending the drag on a node with a connected wire, the Blueprint graph will freeze up. There is an attached video that showcases the issue as well.


This was reported and tested in 4.20.3 (CL-4369336). This was reproduced in 4.21.1 (CL-4613538) and Main 4.22 (CL-4670176)

Steps to Reproduce
  1. Open the UE4 Editor and create a ThirdPerson project
  2. Open the ThirdPersonCharacter Blueprint
  3. In the Blueprint graph hold down the shift key, click and hold the left mouse button to highlight a few blueprint nodes. End the shift-drag on a blueprint node with a connected wire

Results: The line you finish on is stuck highlighted and every other line is dimmed. Various operations stop working correctly until you refresh the graph by recompiling or placing a comment node.

Expected: The nodes just highlight as normal

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ComponentGameplay - Blueprint Editor
Affects Versions4.
Target Fix4.22
Fix Commit4682814
Main Commit4736445
Release Commit4862694
CreatedDec 26, 2018
ResolvedJan 4, 2019
UpdatedFeb 12, 2019