I have a pretty basic load image from server line code:
Glide.with(view.getContext()).load(url).placeholder(R.drawable.default_profile).into(view);
Incase none of the above solves it, and you're setting the 'src' property on the ImageView, it won't work. I was mistakenly setting the 'src' on the ImageView in xml and taking that out solved it for me.