Disable JQuery Processing in WP-Optimize
If you have problems with any of your Divi plugins after installing WP-Optimize, you may be able to resolve it by by excluding jQuery from WP-Optimize's minify feature like so:
Divi Booster v4.0.8 and upwards automatically apply the setting as needed. In earlier versions, a number of Divi Booster's features were affected by WP-Optimize's processing of the jQuery library, including the options to add text to the top header, make accordions closeable and make accordions closed by default. Configuring WP-Optimize as above, to exclude processing of the jQuery library, should resolve this.