Imported_sparky your server is hosted? You have to ask the company to release 16 slots. If there are 16 slots you cant connect via lobby.
Where do you put these commands?
Code:
sm_cvar sv_visiblemaxplayers 16
sm_cvar l4d_maxplayers 16
sm_cvar l4d_survivor_limit 8
sm_cvar l4d_infected_limit 8
sm_cvar z_max_player_zombies 8
sm_cvar l4d_supertank 1
sm_cvar sb_all_bot_team 0
sm_cvar mp_gamemode versus
sm_cvar z_versus_smoker_limit 2
sm_cvar z_versus_boomer_limit 2
sm_cvar z_exploding_limit 2
sm_cvar z_hunter_limit 6
sm_cvar z_common_limit 40
sm_cvar z_mega_mob_size 60
sm_cvar z_mob_spawn_max_size 40