I had some old posts in this forum somewhere in the 2008 September time frame. But I am not able to retrieve those posts. Have they been deleted? If they exist, how can I retrieve them?

Click http://sourceforge.net/search/?group_id=111543&type_of_search=forums - then put your user name in the “posted by” field and hopefully it will find your old posts.  I think you can also do it through your profile page in SourceForge. Regards.