Me too! Have the same error:
Fatal error: Call to undefined function getMenuTitle() in /usr/www/users/ftpuser/components/com_sef/sef_ext/com_sobi2.php on line 66

ARTIO JoomSEF v3.3.1
Bought and installed SOBI2 JoomSEF 1 Extension
Joomla! 1.5.11
PHP 5.2.0
SOBI RC 2.9.2.1

I do not see the SOBI2 JoomSEF extension in the list of Installed SEF Extensions in Artio JoomSEF component? Is this normal? The files are there on the server though.

Can someone please help us?

This is the first time I'm using Artio - it was on recommendation from another developer, and I'm already regretting it.. Maybe it's just something small?