Worlds from Realms not rendering

Hello!

I am having trouble rendering one of my worlds (http://www.minecraftworldmap.com/worlds/v7GzK). Whenever I upload it tells me that everything was successful but after that I just get a blank screen. I have gone through the suggestions in other threads, checking files, rerendering, etc and nothing yet. This happens only with worlds I download from my Realms account. Worlds I upload from single player show just fine.

Thank you in advance for any advice or help.