[iojam]

Parture,

and it doesn't work. It doesn't recognize it as a web page even though it is.

it looks ok. What is exact error message you get?

fneumeier,
you can modify vbseo_sitemap_functions.php file for this:
FIND:

define('VBSEO_DAT_FOLDER', VBSEO_SMDIR . '/data/');

REPLACE WITH:

define('VBSEO_DAT_FOLDER', '/path/to/your/forums/');

and manually submit your sitemap files in google webmaster account.