EDIT:
looked at the developer console and this is what I see:
Refused to display
'https://xxxx-dev-ed.my.salesforce.com/?ec=302&startURL=%2Fsfsites%2Fl…OP%26siteId%3D0DM41000000GHYK%26language%3Den_US%26orgId%3D00D41000000W5Rn'
in a frame because it set 'X-Frame-Options' to 'deny'.https://xxxx-dev-ed.my.salesforce.com/?ec=302&startURL=%2Fsfsites%2Fl…OP%26siteId%3D0DM41000000GHYK%26language%3Den_US%26orgId%3D00D41000000W5Rn
net::ERR_BLOCKED_BY_RESPONSE
Community page is not loading in the community builder I have no idea what is going on and I have been waiting waiting no response its been 10 minutes
I found that its known issue? is that fixed? this post is 10 days old
https://success.salesforce.com/issues_view?id=a1p300000008esnAAA
Best Answer
I'm replaying in order to share my experience with the same issue.
I had similar problem with community builder, which failed to load. This happened also after that the known issue was fixed.
My problem was connected to cache and cookies, i on suggestion of salesforce support, deleted all the cache and cookies related to salesforce, and now the Community Builder load properly.
I hope that it can be useful to other people that may experience same problem.