I'll check this out, although I'd like to know what's going on here too:
--------- Parsing Arguments ---------
Parsing command line arguments:
Error opening zip (Add-Ons/Brick_18Degree.zip), need to handle this better...
Error opening zip (Add-Ons/Brick_2x2FRoundPrint.zip), need to handle this better...
Error opening zip (Add-Ons/Content_ZonearkWindows.zip), need to handle this better...
Error opening zip (Add-Ons/Gamemode_CaptureTheFlag.zip), need to handle this better...
Error opening zip (Add-Ons/Item_parachute.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_Content.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_DoorsPack0.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_DoorsPack1.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_DoorsPack2.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_SwitchesPack1.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_SwitchesPack2.zip), need to handle this better...
Error opening zip (Add-Ons/Print_1x1f_Coins.zip), need to handle this better...
Error opening zip (Add-Ons/Print_1x2f_DemiansMoneyPrints.zip), need to handle this better...
Error opening zip (Add-Ons/Script_HeadcrabZombie.zip), need to handle this better...
Error opening zip (Add-Ons/Script_Push_Broom_Reflector.zip), need to handle this better...
Error opening zip (Add-Ons/Server_BloodAndGore.zip), need to handle this better...
Error opening zip (Add-Ons/Sound_Teleporter.zip), need to handle this better...
Error opening zip (Add-Ons/Sound_ZeldaSFX.zip), need to handle this better...
Error opening zip (Add-Ons/Tool_RPG.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_Covered_Wagon.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_HangGlider.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_Mini_Jet.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_Pioneer.zip), need to handle this better...
Error opening zip (Add-Ons/Weapon_Scythe.zip), need to handle this better...
--------- Loading Common ---------
Error opening zip (Add-Ons/Brick_18Degree.zip), need to handle this better...
Error opening zip (Add-Ons/Brick_2x2FRoundPrint.zip), need to handle this better...
Error opening zip (Add-Ons/Content_ZonearkWindows.zip), need to handle this better...
Error opening zip (Add-Ons/Gamemode_CaptureTheFlag.zip), need to handle this better...
Error opening zip (Add-Ons/Item_parachute.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_Content.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_DoorsPack0.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_DoorsPack1.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_DoorsPack2.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_SwitchesPack1.zip), need to handle this better...
Error opening zip (Add-Ons/JVS_SwitchesPack2.zip), need to handle this better...
Error opening zip (Add-Ons/Print_1x1f_Coins.zip), need to handle this better...
Error opening zip (Add-Ons/Print_1x2f_DemiansMoneyPrints.zip), need to handle this better...
Error opening zip (Add-Ons/Script_HeadcrabZombie.zip), need to handle this better...
Error opening zip (Add-Ons/Script_Push_Broom_Reflector.zip), need to handle this better...
Error opening zip (Add-Ons/Server_BloodAndGore.zip), need to handle this better...
Error opening zip (Add-Ons/Sound_Teleporter.zip), need to handle this better...
Error opening zip (Add-Ons/Sound_ZeldaSFX.zip), need to handle this better...
Error opening zip (Add-Ons/Tool_RPG.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_Covered_Wagon.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_HangGlider.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_Mini_Jet.zip), need to handle this better...
Error opening zip (Add-Ons/Vehicle_Pioneer.zip), need to handle this better...
Error opening zip (Add-Ons/Weapon_Scythe.zip), need to handle this better...
Do any of those appear/work ingame?