I'm following this tutorial, and when I import the reference image I get a glitchy plane:
(the one on the right is the Image as Plane, while the one on the left is an Empty with an image)
I have made sure that the image, found online, was transparent, using Photoshop:
In trying to troubleshoot this, I have looked at this question, but it doesn't help me, as I can't reproduce the steps given in the answer.
Basically, I'm stuck looking for parameters for this object. There's nothing in the Object Data panel, I tweaked Viewport Alpha in the Material tab but still nothing...