Ever since I migrated from TWiki 4.1 to 4.2, the attachment table is always hidden. I can't see ay attachments on the topic page itself, regardless of the whether the 'h' attribute is set on the individual attachments.
If you answer a question - or have a question you asked answered by someone - please remember to edit the page and set the status to answered. The status is in a drop-down list below the edit box.
I found out what it was.
I had modified the CSS to hide the table display of form data, as described at HidingForms. That turns out to be a bad idea, because the attachment table shares the same CSS class.
So I modified the view template instead: