Lost My Visual Editor on Posts/Pages

I have lost the visual editor in my wordpress theme site (www.reliefteaching.com). I was running Radiance and the VISUAL Editor stopped working for posts and pages. The tab is still present but the page is blank. I recently upgraded to Thrive Pressive but it didn’t solve the problem. I can use the TEXT editor. I have checked my user profile and the DISABLE VISUAL tab is unchecked. Any ideas?