Every post and page will be forwarded directly to the browser without any correction. The plugin is extremely simple and effective.
This function modifys TITLE, CATEGORY, BR, HR and other elements. It tries to fix Unicode characters and HTML tags. You can spend a lot of time searching for the reason of strange behaviour in your site. Often it is this function.
With wptexturize you will get some funny things like long dashes, trademark symbols and apostrophes where you wanted to enter usual ASCII characters. Without this function you have to put the right things in the post directly. If you want a dash, use a dash, and you will get a dash.
If you have PHP code in your posts and trust your authors.
Or ask the author on netaction.de.