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its super strange. at dev site still happening.
i'm not touching your live site, only dev site.
because the issue has been resolved at your live site, it would be great if you clone your live site to dev site. and please make sure the server configuration are identical for both (live and dev site)
are you sure already turn off php cache? like memcahe or apc or accelerator.
see, your server still in caching.
and I cannot login to administrator. invalid login detail. please edit your first post at this topic to make correction.