Great plugin! Just started getting this error at the top of most of the popup windows (eg. codemagic editor etc.):
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/xxxxxxx/public_html/blog/wp-content/plugins/ultimate-tinymce/addons/preview/preview.php:4) in /home/xxxxxxx/public_html/blog/wp-content/plugins/si-contact-form/si-contact-form.php on line 1925
Noticed something similar is being reported by other users too so thought this info might help.