Same with me!
Recent update of Jetpack makes backend unusable. Manually removing Jetpack restores functionality. Frontend operation seems to be just fine though.
This is what happens in the backend after activation of the plugin:
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/aryo-activity-log/classes/class-aal-settings.php on line 27
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/aryo-activity-log/classes/class-aal-settings.php on line 30
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/contact-form-7/admin/admin.php on line 547
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/duplicate-post/duplicate-post.php on line 49
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/global-content-blocks/global-content-blocks.php on line 280
Warning: array_merge(): Argument #2 is not an array in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/glossary-by-codeat/admin/class-glossary-admin.php on line 173
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/hyphenator/plugin.php on line 66
Warning: array_merge(): Argument #2 is not an array in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/image-regenerate-select-crop/image-regenerate-select-crop.php on line 1743
Warning: array_merge(): Argument #4 is not an array in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/jetpack/class.jetpack.php on line 3721
Warning: array_unshift() expects parameter 1 to be array, string given in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/manual-image-crop/manual-image-crop.php on line 69
Warning: array_merge(): Argument #2 is not an array in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/mark-posts/admin/class-mark-posts-admin.php on line 257
Fatal error: Uncaught Error: Cannot unset string offsets in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/siteorigin-panels/inc/admin.php:118 Stack trace: #0 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-includes/class-wp-hook.php(300): SiteOrigin_Panels_Admin->plugin_action_links(”) #1 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-includes/plugin.php(203): WP_Hook->apply_filters(”, Array) #2 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/jetpack/sync/class.jetpack-sync-module-callables.php(143): apply_filters(‘plugin_action_l…’, ”, ‘siteorigin-pane…’, NULL, ‘all’) #3 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-includes/class-wp-hook.php(298): Jetpack_Sync_Module_Callables->set_plugin_action_links(”) #4 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array) #5 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-admin/admin.php(154): do_action(‘admin_init’) #7 /www/htdocs/w00d9 in /www/htdocs/xxxxxxxx/DOMAINS/yyyyyy/wp-content/plugins/siteorigin-panels/inc/admin.php on line 118