This is not a critical Bug...
In Fact, it's probably a Netscape Bug rather than a php-
bug...

Symptoms:
Netscape 4.x on Win98 (Possibly Win95/00 as well) won't 
display html-source or print Page

Occurs: 
-when output-buffering is enabled - ob_start("gz_handler")

Does not occur: 
-on any other Browser/System tested (IE, Opera, MacOSX)
-when gz_handler is not specified as callback

Example:
not available, since problem was fixed by disabling ob for 
affected browsers on our production server.

My Configure line:
'./configure' '--with-apache=../apache_1.3.22' '--with-
mysql' '--with-pgsql=/usr/local/pgsql' '--with-t1lib' '--
with-tiff-dir=../tiff-v3.5.6-beta' '-with-ttf=/usr' '--
enable-inline-optimization--enable-shared-pdflib' '--with-
swf=/usr/local' '--enable-ftp' '--with-openssl' '--disable-
short-tags' '--with-pspell' '--enable-gd-native-tt' '--
enable-gd-imgstrttf' '--with-freetype-dir=/usr/local/
include/freetype2' '--with-zlib-dir=/usr/local' '--with-gd' 
'--with-jpeg-dir=../jpeg-6b' '--with-png-dir=../libpng-
1.2.0' '--with-oci8=/opt/oracle' '--enable-sigchild'