Drat. Lost another one. In Safari running OSX 10.9.5 (Mavericks), I was writing a draft for this page, I accidentally clicked on an external yelp link at about 10:25 or a few minutes after, hit the back button on my browser, and the draft was gone. I tried to replicate the problem but was unable.
This may reflect a problem with my browser more than HO— links are supposed to open up in a new tab, but in this case it advanced in the same window to the yelp page.