Chuck-
I'm also having this issue with some of the html displaying in the ad description of showcat (see attached screenprint). I just downloaded the latest pp classifieds a few days ago. I tried the fix you gave in this post but no change. The page source (below) looks ok, so I'm not sure why the partial html is displayed instead of the link. Hope you have a great idea to fix this.
Code:
Content visible to verified customers only.
Sorry, forgot to mention I'm using the advanced wysiwyg editor, but also tried basic with same results