I recently encountered a strange thing for the first time with Wordpress...all of my text boxes in every widget sidebar disappeared! Other widgets are still there. Has this happened to anyone else? I am using 10 different sidebars on 10 different templates and all text widgets have failed. Is there a limit to how many sidebars you should have? What else could be the problem?
I decided to use Widget Logic instead of so many sidebars and that seems to have at leat circumvented the issue.
Possibly you must enable debug to true in your wp-config.php file by writing
define( 'WP_DEBUG', true );
to find out what's the exact issue, this will show you all the errors in wordpress dashboard, alternatively you can also check console log in the browser for errors, a proper debugging will probably resolve your issue.