Ive upgraded tonight from 3.8.4 to 4.0.6 and everything appeared to be working great until i started running update counters as advised by the admin cp, since running the counter every page in my admin cp comes up with 'page not found' and my main forum either gives blank pages, page not found, database errors or redirects to install/install.php seemingly randomly.
Ive tried the fixes described in here and they dont work for me, please someone help!
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