Are there any files that should be deleted when downgrading to 1.7.11 from 1.7.13??
No files newly introduced between Elgg 1.7.11 and .13. Also no files removed. So, you should be able to simply overwrite everything.
1.7.13 has been pulled from the download page. I've also fixed the issues. Any nightlies available here after (but not including) 2011-10-19 will have the fixes. Testing by community members would be great to make sure this release actually fixes the issues with 1.7.12 and 1.7.13.
Things to look out for:
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Security issues should be reported to security@elgg.org!
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