I am experiencing the same issue after upgrade:
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'ot_register_theme_options_page' not found or invalid function name in /home/content/14/11547914/html/wp-includes/plugin.php on line 406
Warning: Cannot modify header information - headers already sent by (output started at /home/content/14/11547914/html/wp-includes/plugin.php:406) in /home/content/14/11547914/html/wp-includes/option.php on line 571
Warning: Cannot modify header information - headers already sent by (output started at /home/content/14/11547914/html/wp-includes/plugin.php:406) in /home/content/14/11547914/html/wp-includes/option.php on line 572
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'ot_register_theme_options_admin_bar_menu' not found or invalid function name in /home/content/14/11547914/html/wp-includes/plugin.php on line 487
Any workarounds other than disabling the plugin? Can somebody share a link to an old version of this plugin that I can reinstall until things are resolved? Thanks.
