When you attempt to restart Apache you may see:
[Mon Jul 25 12:40:23 2011] [warn] module rpaf_module is already loaded, skipping
[Mon Jul 25 12:40:23 2011] [warn] module rpaf_module is already loaded, skipping
This means it has loaded the old rpaf module.. For me I had to jump into:
mods-enabled/rpaf.load
and comment out the old mod_rpaf module.
Simples!