It never did that for me...
No TJ you didn't imagine it. Well, either that, or we both did..
You imagined it. But to make that happen is pretty simple. Just right click on the image in the text editor, add/edit link, and link to the full size image.
I thought it used to be that when you inserted an image, it automatically allowed you (when reading the blog) to click on it to bring it up to full-size. This isn't happening anymore. Was this a feature I imagined, or am I doing it wrong all of a sudden?