CS6 Effect Presets Gone

I opened CS6 this evening to do a quick master of a track with one of my effects presets and... They're all gone. I've no idea what happened.

I hid the folder in AppData/Roaming and it recreated the stock presets, but when I swapped it with my folder again, they were all still gone.

Is there anything I can do? I have 40-50 mastering racks set up there for various configurations that I'd probably never be able to recreate again from scratch.