v160521

• Bug Fix: Fixed a bug that, in some scenarios, resulted in "PHP Fatal error: Undefined class constant 'CACHE_PATH_NO_PATH_INDEX'". This also affected the Cache Statistics feature (Comet Cache Pro), resulting in a blank panel when hovering over the Cache Stats button in the menu bar. See Issue #752.
• Bug Fix: When the PHP OPCache extension is active, the OPCache is now cleared when a WordPress plugin is upgraded, activated, or deactivated. This works around an issue that could produce a fatal error when the PHP OPCache contains cached PHP code that conflicts with new PHP code introduced by an update. See Issue #740.
• Enhancement (Pro): It's now possible to disable the WordPress Admin Toolbar when Logged-In User Caching is enabled with a new option in Comet Cache → Plugin Options → Logged-In Users → Disable the Admin Toolbar for Logged-In Users & Comment Authors? Props @renzms and @KTS915. See Issue #690.
• Enhancement: The the option to automatically clear the cache for Custom Term Archive Views (see Comet Cache → Plugin Options → Automatic Cache Clearing → Auto-Clear "Custom Term Archives" Too?) is now enabled by default. This feature was previously disabled by default, which lead to confusion about why those cache files were not being cleared automatically when a Custom Post Type with a Custom Term Archive View was being used. Props @renzms. See Issue #693.
• Enhancement (Pro): A new filter allows overriding the default behavior to clear the user cache upon login and logout when caching for Logged-In Users is enabled. See this article for details. Props @KTS915. See Issue #756.