I was recently asked by a client to sort out the SEO on their wordpress website. I successfully added the Yoast SEO Plugin, but when I activated it, their website went blank. I deactivated the plugin and the website returned as normal. The website uses a custom theme and uses WordPress 3.1. Any thoughts?
Thanks Jamie. If I update the current version of wordpress from 3.1 to 3.5.1, is there any danger that any custom code or anything else on the website may be altered? I am scared that I will not be able to reverse the action once implemented.