My guess would be that you already had an .htaccess file for vBSEO in your forums directory and you overwrote it with the .htaccess file in the vbSEO sitemap distribution. The instructions tell you that if you already have an .htaccess file (which everyone that's already running vBSEO should) then you need to just add 3 lines to the very bottom of it. Here's the note from the installation docs:
Quote:
Note: If you already have an .htaccess file in your forum root, DO NOT upload the vBSEO Google/Yahoo Sitemap .htaccess file as it will replace the contents of this file. Instead, enter the following code in your 'forum-root/.htaccess' file at the bottom:
RewriteEngine On
RewriteRule ^((urllist|sitemap).*\.(xml|txt)(\.gz)?)$ vbseo_sitemap/vbseo_getsitemap.php?sitemap=$1 [L]
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