Hi, I've had the old version of this plugin (before v4) running for a year or so without problems. But now that I have installed v4, I encountered a problem.
When I am writing my posts, I do not use httpv://... in the post editor. Instead, I use a custom shortcode. In functions.php this custom shortcode then gets converted into the appropriate httpv://... url.
Now before v4 your plugin recognised these links just fine. But now, your plugin completely ignores these links, and what I see on the post-page is actually "httpv://", rather than the video.
Have you got a fix or workaround for me please?
Or in other words, think about forcing the plugin to parse a certain content for "httpv:://" strings, i.e.:
$smart_youtube = new SmartYouTube(); echo $smart_youtube->check($mycontent);
Until then I have just downgraded to version 3.9.1 (http://wordpress.org/extend/plugins/smart-youtube/download/) and everything works again. Please fix version 4!