I get the following error when trying to follow an user:
"An error occurred while processing the request. Please try again later"

Nothing appears in Event Viewer
With Firefox I obtain this answer: [HTTP/1.1 200 OK 3984ms]
With Fiddler I obtain a 200 as result but with a JSON error. If I try with the friend option, JSON result successful
All IIS Log entries like this /DesktopModules/MemberDirectory/API/MemberDirectory.ashx/Follow has status 200

It's not a skin problem. Almost of my skin, cause I've tried with a standard one and I've got same effect.