Error with _unserialize in Session.php

[eluser]Unknown[/eluser]
Hi, after almost five hours of debugging I've come upon something strange.

My problem was that once I enabled the session library the application could only load as long there were no cookie set.
Everytime a cookie was set the application would just show a blank page, at first I thought it had to do with my Apache configuration and the header. Absolutely nothing was logged in apache, php etc.

I finally tracked it down to the Session.php core file.
After trying my way down the methods, I found that

Code:

$data = @unserialize(strip_slashes($data));

would just kill the application without warning or display errors.

Right now I've just done a quick fix and removed both serialize and unserialize with a json_encode and json_decode.
Works like a charm.

Anyone else had the same problem or now what could be the reason of this?