This from messages above:
One thing that might be added is a notice when you try to bring in HTML and it doesn't work to switch to HTML Tidy. You might offer it as a switch to HTML Tidy for input. I couldn't see anything wrong with the HTML, but with just pretty print on, it would not bring it in. Otherwise it worked great.
This is noticeable because the preference was accidentally changed to Pretty Print instead of Pretty Print Tidy. Apparently there are a lot of invalid files out there that have been getting cleaned up automatically. The setting will be corrected in the next version (everyone using Pretty Print or Pretty Print Tidy will get reset to use Pretty Print Tidy on first use).