Today I was going a little nutty. I was in the middle of a very productive swing customizing until my recent loss of drag & drop got the better of me. Frustrated, I turned to the ever helpful community and found just what I was looking for. I wanted to report in the event that anyone is struggling with this issue.
1. Click on the settings in your IE 11 Browser
2. Go to Compatibility View Settings and add https://*.dynamics.com and click OK.
3. Then Go to Security in Internet options.
4. Click on Trusted Sites and then sites
6. Add https://*.dynamics.com to the trusted sites
7. Then Enabled Display Mixed Content in Internet Security Zone.
8. Enabled Display Mixed Content in Trusted Site Security Zone
9. Restart your browser.
Hopefully it works for you as well as it worked for me. Happy Monday!