Had issues with my site for the last couple of weeks which is hosted with Siteground. Support failed to track down the issus. I was unable to install, disable or delete any themes or plugins. I was also unable to post content ‘sometimes’, kept getting memory errors.
Fatal error: Allowed memory size of 805306368 bytes exhausted (tried to allocate 20480 bytes) in /home/customer/www/ffffff/public_html/wp-admin/includes/class-wp-filesystem-base.php on line 416
Today I removed all plugins and through file manager and brought them back one by one to track down the issue. When I brought back SG Optimizer the issues returned.
I tried to install the plugin through the WordPress repos but it ‘Failed’ other plugins install fine now.