Since I upgraded I've noticed a few 404 errors popping up and it seems that yahoo is incorrectly indexing my pages.

Yahoo index's my page as hxxp:// www.mywebsite.com/englishforum/english-i...and-vocabulary./what is ESL, english, second, language

The correct page is hxxp://www.mywebsite.com/englishforum/english-i...second-language.html

Does anyone know what is going on? How can I fix this?

I am running Kunena 1.5.8 on joomla 1.5.15 with artio 3.5.4
and plugins
AlphaContent 2.0.1
Content 2.0.13 <<This reads higher than the newest version!!!
Glossary 2.0.1
Kunena Forum 2.0.5
User 2.0.3

Thanks in advance.

I've substituted my real website name with mywebsite.com

Hello,

I think the problem might be the "." in the URL in "english-i...and-vocabulary./what...".
Dot in URL on other place than domain name can be problematic and we certainly do not recommend using it.

Not sure what else could be causing that, especially if it is ok with other search engines.