This is the msg. I get when I try to post attachments:

"NOTE: If you had an Attachment in your post, you will need to reselect the Attachment again in the Browser Box for security reasons."

It does not appear in a pop-up, but instead is on the forum page just under the window where you browse for the attachment.  If I do what it asks and reselect the attachment, I get the same msg.

daveboy