Hi there,
Does anybody have an idea where these visuals artifacts may come from ?
Has anyone seen this before ?
It only happened today, I didn’t touch the code of the gizmo to move the actors, and yet it’s the latter that seems to be causing the problem…
I tried playing in viewport, PIE, standalone… same issue everywhere 
It looks like GPU artifacts at a glance. Is this happening only in unreal engine or in other 3d accelerated programs / games?
Have you overclocked you GPU? Maybe try under-volting it to see if the lines go away?
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It can be a post-process component in BP_QuietGizmoManager. Try turning it off.
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Thank you, I had two outline materials which were fighting I guess. It solved the issue !