Please turn on PHP errors. There are minor issues with the plugin not insuring that indexes are defined. Here is the code that we are getting.
To replicate, simply update another plugin, update a menu, and some other sections of WordPress admin section.
This is the exact error I get, seems to repeat a few times, which I omitted. I could fix it on my site, but then once your new version rolls out it will override my changes.
Notice: Undefined index: vsw_noncename in /export/www/REMOVED/wp-content/plugins/video-sidebar-widgets/class-postmetavideowidget.php on line 296