[@jakubmarian Participant 12 years, 10 months ago]

Have you created the topic using the form that’s part of the forum, or using the administration panel? If I use the administration panel, everything is saved as it should; however, when I use the submit form in the forum, characters get converted to HTML entities.

I tested it using a clean installation of the latest version of WordPress with the default theme where the only plugin installed was bbPress, with exactly the result I have described above.