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Natural Inhabitants of Black Mesa

Lots of mods have not been updated to work with the new version of the game. Until they are updated, they may (and probably will) cause all kinds of strange and seemingly unrelated bugs. If you want the best Black Mesa experience, make sure that you do not have any mods installed. If you have had mods in the past, it may be worth uninstalling the game, deleting all local files in Black Mesa, then reinstalling the game.