If you are using a Debug.DrawLine version that takes a color parameter, just make sure that you set the color alpha, which by default is 0 (invisible) when the node is created ?
Let me know if that was indeed the case.
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I can’t thank you enough! Yes, that was the case and in fact it was the same reason i couldn’t change group colors too! (I’d never thought a color picker would default to alpha = 0)