@partofstyle - just drop a bit of code in your wp-config.php file and you should be right. I do agree with Norcross however in regards to plugins changing core files - not good at all.

@Steve Moss - I believe Relevanssi has now issued a bug fix update for this.

@Joseph McLean - I've noticed some issues with the Yoast SEO plugin but I expect this will be fixed soon as well.