Comment on Technical Support by SEO Dave.

WordPress Technical Support Widgets/menus not saving is unlikely to be a Stallion Responsive bug (no other reports).

Search Google for

WordPress widgets not saving

and you’ll see it’s not uncommon.

Could be a recent plugin, your browser playing up (javascript issues), PC needs restarting…. Also see:

To update go to the WordPress updates page under your Dashboard and the update should be there. The child theme hasn’t been updated recently, so won’t need an update, if it did it’s manual using FTP taking into account if you’ve made customization.