I'm afraid I have the same problem. Does the component use a particular 'user postion' to display, or is it hooked to the article?
Also, I did get some warnings on my install, perhaps this has something to do with it? The component is there, and configurable, but I got the following warnings on install
There was a problem with your installation
error when moving /home/mwoodwar/public_html/administrator/components/com_comment/plugin/joscomment.php
TO /home/mwoodwar/public_html/plugins/content/joscomment.php
Please, contact the support.
Thanks.
error when moving /home/mwoodwar/public_html/administrator/components/com_comment/plugin/joscomment.xml
TO /home/mwoodwar/public_html/plugins/content/joscomment.xml
error when moving /home/mwoodwar/public_html/administrator/components/com_comment/plugin/josccleancache.php
TO /home/mwoodwar/public_html/plugins/system/josccleancache.php
error when moving /home/mwoodwar/public_html/administrator/components/com_comment/plugin/josccleancache.xml
TO /home/mwoodwar/public_html/plugins/system/josccleancache.xml