Session data disappearing on redirect

[eluser]pornnarnold[/eluser]
Yep, I had a look through those but I can't work out why the slashes aren't being stripped.
If I echo the same data in one of the sites where my sessions work I see the same data but without the slahes.

Edit: I tried just adding echo serialize($data); before the return of _serialize and it gives me the serialized array but without slashes.
It's definitely something in the Input library affecting the cookie returned.