I noticed this issue with encoding when I installed the pro version. The plugin adds this this following line right on the beginning of <?php the_content(); ?> in the mobile theme:
<!–?xml version=”1.0″ standalone=”yes”?–>
This was making the first tag of the content to show weird characters instead of what should be accented characters. It was a big problem as my website is in Portuguese and we use a lot of accented characters.
I made some tests with the non-pro version and the weird characters was showing up in the desktop theme but not in all posts, I don’t know why.
To solve this I looked for the code that was adding the xml line in the content and I found this line twice in the file any-mobile-theme-switcher-pro.php (version 1.5 pro):