I've recently upgraded to TWiki4.0.4 (from a TWiki version Version: 02 Sep 2004 $Rev: 1742, using the automatic upgrader).
I've got a problem that applies to both old attachments a newly created attachments. When you click the manage attachment button for an attachment (lets say "Vanorgcharta.jpg" you get a URL like this:
as you can see, theres an extra % following the filename. This suffix prevents you from manipulating the image, TWiki will complain the file cannot be found.
If you manually correct the URL, then TWiki functions as normal.
I just checked this on 4.0.4 and on TWiki-4 branch, and it functions just fine. Please verify that you are using stock 4.0.4 pattern skin, and attach the .txt file corresponding to a topic that has an attachment that shows the problem here.
No feedback after two months. The checkin is irrelevant, AFAICT. Discarding.
I saw this and thought: "Who is the idiot that checked in something irrelevant to this bug report?" And the answer is......the idiot is ME! AArgh. Checkin 11203 belongs to 2689 so I'll move it there.