HI Adam, so sorry this happened we added a notice to BACKUP the site for this update on wordpress.org site and in the change log of the Gantry 4. Well basically you lost only widgets you should not lost any RokSprocket data. Tell me if you have issues still and i will take a look.
I've just picked up this topic while searching for solutions to amy own issue which I believe might be related.
I'm building a new site using Wordpress and a Gantry system with a few different Widget Overrides. One of which now times out everytime I try and open the associated widget page for editing. I've chatted to a few different people but no solution as of yet.
Thanks for the reply. I'm halfway through doing that as we speak. The new override page has frozen twice so far but at least it is loading at all. Fingers crossed it will stay this way.