Broken Shortcodes (WP 3.8)

Thank you for a great plug-in. Unfortunately, I cannot use it unless this is fixed:

My shortcode:

[content_box title="<h2 style='color: #ffffff'>My Title</h2>"]
My sample content
[/content_box]

Single quotes are changed to double-quotes… which totally breaks the shortcode:

[content_box title="<h2 style="color: #ffffff">My Title</h2>"]
My sample content
[/content_box]

Would appreciate your reply on whether you will fix soon, or if I should abandon this plug-in.

Thank you!

Ryan

https://www.ads-software.com/plugins/preserved-html-editor-markup/