no gnus stores empty attachments

[Rud1ger Sch1erz]

Hi,

I open an email in a nnimap group (gmail) in the article buffer. The
email contains a pdf attachment.

When I try to open the attachment (`v' or mouse-1), evince pops up,
complaining: can't open document.

When I look at the temp file, which is generated, it is empty (0 bytes).

When I try to store the attachment (`o'), the file's empty, too.

I run:
 - No Gnus v0.18
 - GNU Emacs 23.2.1 (x86_64-pc-linux-gnu, GTK+ Version 2.21.6) 
 - Ubuntu 11.04

Same problem appears, when I use No Gnus with emacs 23.4 at a Windows 7
system.

However, this problem does not appear, when I use gnus 5.13, which comes
with my emacs.

Any ideas, how to track down this issue?

-- 
Tschau
Rüdiger