I recently upgraded to 2.1.2 and encountered this problem I haven't seen before.
I add a label and a spliced sprite to a panel, they overlap each other. The background of the sliced sprite is fully opaque.
The label is completely covered by the sprite, I can't see it at all. I tried adjusting the depth to no avail.
I find that if I tilt the camera a little the text appears.
I'm stumped trying to figure out what the problem is.