First please exclude the TinyMCE editor JS file from Automizer plugin, then delete all cache and reset Autoptimizer cache.
Please navigate to Settings > Autoptimize > Main Tab, click on top right [Show advanced settings] button, find “Exclude scripts from Autoptimize” option, add this JS path ,wp-includes/js/tinymce
, than click on [Save Changes and Empty Cache] button bellow.
Second, navigate to Dashboard > Users > Your Profile and make sure the “Disable Visual Editor” is no checked, it should not be disabled.
And third, it seems you have wrong permission in file system. Use some FTP client, make sure the /wp-content/ and /uploads/ and /plugins/ folders permissions are 755 and files are 644.
Don’t forget delete all cache before checking.