Custom Sidebars Pro Seriously Broken

I don't know how else to put it, but Custom Sidebars Pro is completely broken on my site. It was working in previous version, but after some recent updates it no longer works (at least my widget page is totally broken).

I still get the sidebars that I created working on the front end. But trying to load the widgets page results in complete failure. It tries to load for about 4-5 minutes, then just stops with a fully broken page. No other page in the dashboard is broken, just the Widgets page. It's kind of hard to explain how badly broken it is so I've enabled support access WPMU DEV Dashboard so you can log in and see it for yourself.

Currently, I'm totally unable to modify my sidebars or widgets.

The site URL is