PHP5.6 + PHP7.0 side by side

Hello together, *tl:dr* When i execute a PHP7 request over Apache, then the next PHP5.6 request is blank (without an error log message) *Long version* I have two "independent" installation of Apache and PHP on the same development machine. (both over mod_fcgid) The only difference is the port :80 for production and :81 for testing The current one (used for prod): Apache 24-win64-VC11 / PHP 56-win32-VC11-NTS And the today installed (used for testing): 24-win64-VC14 / PHP 70-win64-VC14-NTS I had some troubles with opcache on PHP7 so i disabled it for now -> in PHP5.6 i still have opcache enabled -> the error msg in PHP7 is: https://gist.github.com/ThaDafinser/d32c7b84933a2d4eddf1 This strange behaviour is left: - when i execute http requests for PHP 5.6 everything is fine - when i execute http request for PHP 7.0 everything is fine - when i switch from a PHP 7.0 http request back to PHP 5.6 request, the first request is "blank" and i dont have an error message My PHP + Apache config used: https://gist.github.com/ThaDafinser/baa3c2d69898c9d1e31e