Hey I'd like to just add I'm having this exact same issue. For me, I tried to update Skyrim by going into Online mode with Steam and that crashed the game. Now, after that was fixed, I can't find any of my mods. None of them are showing up in the Date Files button, which IS available to be clicked on (It's not grayed out). I've tried reinstalling several of the mods (I'm using WinRAR which has never given me problems before), redownloaded them and reinstalled them, even tried a direct copy of all mods I had (for Skyrim) from a Mod Folder I created for the sole purpose of serving to keep a back up copy so I wouldn't have to redownload it all. So... help?