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Hello Esmi, are you somehow involved in development in this plugin? Sorry, I haven’t seen this rule before. The author is native Czech speaking and my post was pointed to him. Here is an English resume:
Whenever I activate the plugin and press Save settings on wp-admin/options-reading.php page all the settings for plugin disappear (checks & text fields). Tested on 3.6.1 &?3.3.1 WP versions. Dump from SQL database follows…