Here is the shader. You must set it up EXACTLY. In particular, make sure the Checkboxes match exactly! No Normals_Forward anywhere. This is because the modern Refract correctly deals with entering and exiting light differently. 

For those of you who've used glass before, it's not wildly different than you've seen before. I'm just emphasizing that noobs should not change things without knowing what matters and what doesn't. I know what matters and what doesn't, so sometimes you'll see small changes from other posting - they probably don't matter. When in doubt, ask.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)