I have installed BWP Security and turned on the option to “Turn off file editor in WordPress Back-end”. This has caused the Quick Cache Options panel to disappear.
I have turned of the option above, set the configurations in Quick Cache and then turned the option back on and there does not seem to be any problem with Quick Cache other than I cannot see the Quick Cache Options panel. Works for me.
There is an older closed post about this that also solves the problem, here.
Also the “Remove write permissions from .htaccess and wp-config.php” options in BWP Security will interfere with Quick Cache continuously if it is set. So, best to leave it off.
Can’t find, Cannot Find, Disappears, Where is? Problem