Oops! It looks like we tried to switch your account but it didn't actually succeed.
This happens for some accounts, and we don't know why. This isn't a problem with the Old Layout extension, but a limitation of Facebook itself. It is preventing some accounts from switching.
Hopefully the styles applied to the new layout will at least be an improvement for you.
The extension might still work for other accounts on this same browser. Unfortunately we don't yet know why some accounts can't be switched, but we're working on it.
For now, you can click to hide the panel below and it will go away until a new version is released.