I am having some trouble using .html (zip) -> .mobi conversion.
As soon as I enable post-processing (and check any of the alternatives) my resulting mobi loses all formatting and outputs html tags in cleartext (see picture below)
This is happening consistently with multiple html files, Calibre 0.8.12 on Win7.
I apologize if I posted this in the incorrect section.
Edit: also, my heading is wrong. It's supposed to be html -> mobi and nothing else.
Moderator Notice
Fixed title per your request