IMP 3 / IE6 exposed php code

[Liam Hoekenga]

We're having a problem w/ our installation where IE6 users see exposed code
fragments if they use the back navigatation arrow in the browser.  It looks
something like this....

    http://www-personal.umich.edu/~liamr/imp3-ie6-exposed-code.jpg

anyone else run into this?  suggestions?

Horde 2, IMP 3, PHP 4.1.1, Apache 1.3.22, mod_ssl 2.8.5-1.3.22, Solaris (SPARC)
2.6..

thx
Liam