Fixed it! I really like
vBulletin, but it has a LOT of granular permissions settings, and it can be easy to forget about one of them. Try it again one more time -- it should be okay now. I tested it with a Free Member test account.
Click
Go Advanced in the quick reply box at the bottom of a thread page -- you'll see a
Manage Attachments area on the full editor page -- and then follow the instructions at
http://www.digitalfaq.com/forum/show...ages-1529.html
And again, thanks.

I look forward to your report.