Hi there!
I just upgrade to wordpress 3.8 in this 2 sites
1. http://www.unfotografo.es
2. http://www.fotografiadenegocios.com
Hosted with 1and1.
Themes are 1. Workspace, 2. Avada.
And the plugins that are gone are SEO Yoast, NextGen, WPML, Super Cache, Jetpack... among others...
Via FTP I can see the plugins, but through the admin panel everything is empty... If I try to reinstall a plugin through admin panel it tells me the folder is already there and 'error' installing...
Should I downgrade?