Weird autoload bug

[eluser]georgeedwards[/eluser]
Hello all. I've had a production site live for a few months now (ftw.gd) but today just randomly discovered an error. I think it may be due to a hosting PHP upgrade, but they say they haven't upgraded anything. Not a great help.

But anyway, it seems as though, I can't autoload Session properly anymore. In fact, I can't load the library anywhere.

My autoload is:

Code:

$autoload['libraries'] = array('database', 'session');

This produces:

Code:

A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_Loader::$session

Filename: views/header.php

Line Number: 43

The funny thing is, if I take out autoloading of the database library, the Session library loads successfully and works fine.

What gives? Any ideas?