If you go to a topic within the #theme category such as Fakebook Theme if you try to preview the theme on Discourse Theme Creator it does not load
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Yes, I can see this too. Appears that all the preview links are broken!
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Fixed via:
https://github.com/discourse/discourse-theme-creator/commit/cf810cf45e27ffca454ce8666ac1cf4a7150881f
Thanks for bringing this in our notice @ondrej. 
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