[imp] Attachment download problems in IMP-4.0.4 and Horde-3.0.6

[John Wiggins]

Hi all,

I'm going a little crazy trying to figure this out. When users click
on the attachment download button in IMP, the attachment is displayed
as binary data in the message frame, not downloaded.

Users can view viewable attachments just fine (excel, word, etc, using
wv).

Here is my environment:

browsers: All, any

Server:

RedHat EL 4.0 i386
Apache 2.0.52
php 4.3.9
IMP 4.0.4
Horde 3.0.6

If anyone has any ideas, I would love to hear them.