If you're having indexing issues you should first enable search engine friendly URLs with the fake html extension in the Control Panel (CP -> Master Settings -> Primary SEttings -> General Tab -> Advanced Options -> "Enable Spider-Friendly URLs" and "Enable HTML Extention")

Without Spider Friendly URLs Google sees all urls as "/ubbthreads/ubbthreads.php" with qualifiers; at times it will drop the qualifiers on some URLs, resulting in some crawling errors.

Now would probably also be a good time to install this modification so that you're already setup for the v7.6.0 URL scheme; I even have support built for the v7.6.0 in the UBB.Sitemaps modification.

I am a Web Development Contractor, I do not work for UBBCentral. I have provided free User to User Support since the beginning of these support forums.
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