WordPress and TinyMCE Advanced: Failed to load javascript
WP_PLUGIN_DIR customizes the location of files in filesystem. Most likely you also need to customize WP_PLUGIN_URL, which customizes client–facing URL location. If you omit this one, WP will decide it based on WP_CONTENT_URL, which might not at all point to your new location. Another possibility is that plugin/code in question simply cannot handle a custom … Read more