Knowledgebase?

I'm attempting to use Phil Taylor's Joomla Knowledgebase with SEF Advance 2008 on Joomla 1.5.  It comes with a customized sef_ext.php file and yet instead of URLs like this:

kb/Is_Online_Learning_Easy?/

I get ones like this:

kb/is%11online%11learning%11easy/

Even though I have SEFA returning upper case, underscore, and question marks on other components.

I suspect that it's something in sef_ext.php that's changing the article title in the creation of the slug or running it through a filter somehow since I can echo the article title and have it show up as Is Online Learning Easy?

Anyway, I'm attempting to edit sef_ext.php myself and was wondering if anyone had recommendations.  I've attached the file for anyone brave enough to look at it.

Thanks!

This would happen if you use underscore as word separator instead of hyphen. It is due to a a problem in SEF extension for Knowledgebase. I modified extension and attach it here. It will now work correctly both if you use hyphen or underscore as space.