Any ideas on how to debug this problem would be appreciated:
Two Windows 7 (Home Premium) systems, one with Apache 2.2 installed (and working), the other with Apache 2.4 installed (and working). On the Apache 2.2 system, all SSI directives work in my .shtml files. On the Apache 2.4 system all SSI directives EXCEPT the conditionals (#If, #Else, #Endif, etc.) work (in the same .shtml files).
httpd.conf and .htaccess on both systems are (apparently) set up properly to enable SSI.
So... why would all SSI directives EXCEPT conditionals work on one system?