Hey guys,
If you want you can try this
http://www.nzambi.net/addons.zip
it is a clean (contains no mods) _standart_ setup with mm-1.8.7, sm-1.4 and L4DToolZ 1.0.0.10RC2 which is working on my server and also confirmed by rava to work on his server.
add this to your server.cfg:
sv_maxplayers 20
sv_removehumanlimit 1
sv_unlock_sb_add 0
sv_force_unreserved 1
sv_visiblemaxplayers -1
Hope this helps you guys.