Supercache installed, not serving pages

I have Supercache installed on my wordpress site. The previous version, .3, seemed to serve up pages no problem. The latest version, all I’m getting is WP-Cache pages. Nothing from Supercache. I have the .htaccess installed, my apache 1.3.39 has all the mod things required in the read me. It has write access to the cache directory. WP-Cache has been removed.

I get:
<!– Dynamic Page Served (once) in 2.644 seconds –>
<!– Cached page served by WP-Cache –>

instead of:
<!– Dynamic Page Served (once) in 0.194 seconds –>
<!– super cache –>

Ideas?