Plugin Missing from Admin menu

WordPress up to date:YES
– NextGEN up to date:YES
– What version of NextGEN Gallery did you upgrade from?: INCREMENTAL UPDATES ONLY 1 OR 2 LATEST VERSIONS

(please confirm the following, with your server host tech) :
– MySQL up to date (at least 5.0) 5.5.39
– PHP up to date (at least 5.2.4) 5.4.32
– The mod_rewrite Apache module activated: YES
– PHP Safe Mode OFF: YES

Additional information that will help us find a solution:
– Who are you hosted with: VPS on Jumpline
– What theme are you running:Child theme of Canvas (woo themes)
– Which plugins do you have installed and activated? WP_OPTIONS a:26:{i:0;s:27:”LayerSlider/layerslider.php”;i:1;s:33:”admin-menu-editor/menu-editor.php”;i:2;s:19:”akismet/akismet.php”;i:3;s:27:”backupbuddy/backupbuddy.php”;i:4;s:41:”better-wp-security/better-wp-security.php”;i:5;s:45:”enhanced-text-widget/enhanced-text-widget.php”;i:6;s:29:”gravityforms/gravityforms.php”;i:7;s:29:”image-widget/image-widget.php”;i:8;s:21:”ithemes-sync/init.php”;i:9;s:19:”jetpack/jetpack.php”;i:10;s:45:”jquery-t-countdown-widget/countdown-timer.php”;i:11;s:26:”julia-oceanchild/julia.php”;i:12;s:49:”jw-player-plugin-for-wordpress/jwplayermodule.php”;i:13;s:29:”nextgen-gallery/nggallery.php”;i:14;s:43:”phpbb-topics-portal/phpbb_topics_portal.php”;i:15;s:43:”phplist-form-integration-master/phplist.php”;i:16;s:25:”relevanssi/relevanssi.php”;i:17;s:41:”shortcode-exec-php/shortcode-exec-php.php”;i:18;s:43:”the-events-calendar/the-events-calendar.php”;i:19;s:33:”twitter-tweets/twitter-tweets.php”;i:20;s:37:”user-role-editor/user-role-editor.php”;i:21;s:33:”w3-total-cache/w3-total-cache.php”;i:22;s:19:”woodojo/woodojo.php”;i:23;s:39:”woothemes-updater/woothemes-updater.php”;i:24;s:24:”wordpress-seo/wp-seo.php”;i:25;s:28:”wp-robots-txt/robots-txt.php”;}
=============

This error still occurs if I deactivate all plugins except Nextgen Gallery and switch to TwentyEleven theme.

The plugin is still working, but I have no access to the plugin to adjust any settings or add any new galleries or images, etc.,

Thanks for any ideas.

https://wordpress.org/plugins/nextgen-gallery/