We have the problem that attachments can be opened, but a few seconds later the message appears that the file can not be found. And the attachment disappears.
The internal viewer from groupwise works. Also you can save the file and then open it.
Just directly from the mail window doesnt work.
The problem does not exist on all clients.
We have tried a complete new installation. We have checked the access rights to the temp folder. But the user has administrator rights anyway.

Any ideas?

Many thanks and greetings!