I tried to upload an image using the image manager in most recent versions of FF and Chrome but it just causes the browser to hang. 

When you post a message to the forum the message is so long that you cannot read all the text.  It's in a yellowish box and ends with the text "this process may take anywhere from a few minutes to many hours ...".  I think it's indicative of any message that's longer than one line.  It's likely a CSS issue that not only affects your website but all your users.  Please fix this type of stuff.  It's a poor representation of the quality or lack there of that is put into your product.

this site