Hello!
We tried to reproduce this issue on our test servers – and have no luck with this. Please contact us through our internal support. We will check what is wrong and will help you to solve the problem.
we start apache log:
domine_name.net [Wed Jul 27 10:35:17 2016] [error] [client 88.140.0.180] PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 72 bytes) in /home/m/domine_name/public_html/wp-includes/class-wp-image-editor-imagick.php on line 82
domine_name.net [Wed Jul 27 10:35:17 2016] [error] [client 88.140.0.180] PHP Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0
for fix add .htaccess :
php_value memory_limit 256M
Thank you for the conversation.