$context['session_id'] returning false values

[AntiPaste]

Hello,
I'm trying to integrate a custom SMF logout button to my site, but the $context['session_id'] and $context['session_var'] variables are returning session keys that do not match the ones on SMF's own logout button.
For example:

Code ("My button's link") Select Expand

index.php?action=logout;c5b286144=23c39aead6398e9c4f146605a84cc5ad

Code ("SMF button's link") Select Expand

index.php?action=logout;e1cd4796dd1e=e1a40fb6f516ab75a583924adb88bdfa

I'm calling SSI.php, using SMF 2.0 RC4, PHP 5, MySQL 5 and Apache web server.
If you need any more information, don't hesitate to ask

[AntiPaste]

Solved it by disabling 'Use database driven sessions'

[Yigal]

Glad you got it solved xP.