Apache Broken Images: 2.7 + 2.8 with ipf enabled

["Matthew McGehrin" <matthew@subnetmask.net>]

I'm seeing broken images when I view web content on both of my servers. I
have double checked the code, and the images and html are labeled correctly.

For example:

http://bluemoon.reverse.net/~matthew/

Should show the following : yellow bar, red bar, black bar, and then repeat,
yellow bar 2, red bar 2, black bar 2

However, sometimes the pages loads correctly, sometimes it doesnt. If you
hit reload enough times, it might show 4/6 images, or might show 2/6 images.

This is also happening on another system

http://redmoon.reverse.net/~matthew

I am unsure how to debug this. Both systems are running identical
ipf.rulesets. Below is detailed information about both boxes.

Thanks

Matthew

# ipf.rules [shell.reverse.net]

pass out quick on lo0

pass in quick on lo0

# block all non-traceable routes

block in quick on xl0 from 192.168.0.0/16 to any

block in quick on xl0 from 172.16.0.0/12 to any

block in quick on xl0 from 10.0.0.0/8 to any

block in quick on xl0 from 127.0.0.0/8 to any

block in quick on xl0 from 0.0.0.0/8 to any

block in quick on xl0 from 169.254.0.0/16 to any

block in quick on xl0 from 192.0.2.0/24 to any

# block all incoming traffic

block in on xl0 from any to any

# allow escape.com

pass in quick on xl0 from 198.6.71.0/24 to any

# allow identd

pass in quick on xl0 from any to any port = 113

# allow smtp

pass in quick on xl0 from any to any port = 25

# allow http and https

pass in quick on xl0 from any to any port = 80

pass in quick on xl0 from any to any port = 443

# allow pop

pass in quick on xl0 from any to any port = 110

# allow ssh

pass in quick on xl0 from any to any port = ssh

# allow ftpd

pass in quick on xl0 from any to any port = 21

# allow stuff to run on port 1023+

pass in quick on xl0 proto tcp/udp from any to any port > 1023

# allow outgoing traffic out

pass out quick on xl0 proto tcp/udp from any to any keep state

# end

bluemoon# ipf -V
ipf: IP Filter: v3.3.18 (184)
Kernel: IP Filter: v3.3.18
Running: yes

bluemoon# httpd -v
Server version: Apache/1.3.12 (Unix)
Server built:   Oct 31 2000 17:41:06

redmoon# ipf -V
ipf: IP Filter: v3.3.13 (184)
Kernel: IP Filter: v3.3.14
Running: yes

redmoon# httpd -v
Server version: Apache/1.3.20 (Unix)
Server built:   Jul 31 2001 15:22:12