2017/05/23 : Joomla 3.7.0-3.7.2 Problem
The last Joomla release 3.7.0 has a problem with Joomla and caching (progressive & conservative). It's seem the 3.7.1-3.7.2 still make problem with cache and Falang (untranslated menu or 404). Actually i recommand to use the free tool JotCache (Jotcache download link) or desactive cache.
Cache problem issue on Joomla github

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