Could be the problem, it was something similar in Mod if I remember correctly, that in each serer there was a different character. Developers said, that they are working on servers, changing them so that servers could produce more zombies and let more people play, they are working on protection on servers too, but currently not on VAC, but mainly on strong game...forgot what they said, but on strong game functionality or something, so that it would be hard to bypass something and make some injectors to work, then they will strongly aim for VAC security. Mainly all major things regarding game itself will come in early 2014, only something about zombies and servers we can wait in near New Year.
Hah, I just got it too, second time through my entire gameplay at the moment.
I fell unconscious and I had to exit game, I didn't wanted to restart, so I exited, when I wanted to continue it dropped server list, so I assumed that server got shut down in which result I fell unconscious, practically the same as being dead, cause I saw that I was bleeding for no reason. Well, I'm optimistic person, so I'll say that at least I can play again back in color not all the time in gray :D but I lost mountain backpack that has 35 slots, two ammo mags on M4, main M4, military full gear, three masks from Pay Day game, Noxton, Wolf and Dallas (only mask that was a bit damaged), pistol and few other things...what a shame.