After installing defender, was all working until I enabled Audit Logging.
Audit Logging created Whitescreen across whole site.
I had to renamed the plugin wp-defender folder to disable the plugin
Then renamed it back, and went into my main network site plugins and deleted DEFENDER and ALL DATA
I re-installed it and double checked and was able to repeat the whole process.. each time I ended up with the White Screen when I enabled Audit Logging.
I am also using WPMUDEV Chat.
When Defender Hardening Disable PHP Execution is set it breaks the chat. NO chat loads. No Group Chats, No Window chat.
I have reinstalled defender and left those options OFF..