On September 7, 2015 I started noticing that when I was logged into WordPress that the dashboard menu items seemed to disappear and overlap one another. It took me a bit to figure out that this was only happening when I was using Chrome 45 as my browser. Thankfully, I found this blog post http://wptavern.com/a-bug-in-chrome-45-causes-wordpress-admin-menu-to-break. I followed the instructions provided in the article and now all is good. Hopefully, by passing this on I can help spread the word and save your a lot of time figuring out what is going on.