I'm doing a new blog site for a client and added your plugin to it. I love the functionality and understand it's still in beta, but I found a major bug.
If you add "search_engine_content()" on a search page or loop-search.php, it will overwrite the posts listed in the "Recent Posts" widget on the sidebar. It look like this is being caused by the search_engine_get_posts function. It's tying in to the "the_posts" hook which is called by the "Recent Posts" widget. However, I've found an easy and permanent fix.
On line 1047, change:
if(!is_search() || is_dynamic_sidebar())
This will cause the function to return if it is being called from a sidebar/widget. Just thought I'd share in case anyone else had run across this, and that it would be good to add to the next release.
Thanks for this plugin! It's awesome!