Symposium Forums Attachments

I am developing a site and am having no luck finding a fix for this problem; when I attempt to upload a file in Symposium Forum; the program goes through the motions (and seems to upload the file0, but gives me the error code “NOT LOGGED IN 1, admin,[my e-mail address].”

When I look for the file, it is not in media library and seems to be hidden?!?

I can upload to the media library, and post attachments to the blog posts just fine–just not in Symposium Forums.

I am using WordPress 2010 Theme, along with a few plugins–such as Custom Upload Directory, Mass Messaging in Buddypress, (it was installed at one time), Metronet Profile Picture, WordPress Download Monitor, WP Members, among a few others.

I am wondering if I may have a plugin conflict issue, or is this something deeper? I must admit to being a novice at WordPress, so ANY assistance would be most appreciated.