It happened to me also. Last time I logged off I was being attacked in a barn by a bunch of zombies and suddenly got very dark and I couldn't see a thing so I used all my ammo trying to shoot them. The zombies could barely touch me either but one successfully made me bleed. I bandaged myself up, my blood went down below 6000 and I couldn't see anything so I stayed on prone. I think only one zombie was left on me after this, but I couldn't see anything (even with the gamma and brightness to the max), had no ammo, my items weren't working (chem light, flares, flash light...), it was really buggy, so I just logged off and came back later. Also before I continue I would like to specify that I had found and talked to some people earlier on the same game, so everything was fine, but once i tried to bandages myself and didn't seem to work, so I tried again and again and again... I had 5 bandages in total and at some point I successfully bandaged myself up, but all 5 of my bandages disappeared... it seemed really buggy and/or laggy at the time. So I logged off and logged back in later, but I suddenly got invisible to zombies and players. I could take items, but strangely enough, my back pack was fine but what was in my inventory otherwise was disappearing. I could kill zombies and player, could steal from their back packs... My top right UI where you can see all the kills and your blood lost disappeared, I could see clearly in day light (even though I had less than 6000 blood). Local chat didn't seem to work for me, but the side chat did. And after all this shit, I tried to log off and logged back in, had the same problem multiple times, tried on different servers, most of them were telling me I had a bad version and it was barely functional so I went to bed and came back this morning everything was back to normal, and I finally died because I had no ammo and no blood left. When I respawned the game asked me again if I wanted to be a male or a female... Other than all that the game seems fine now... except that I died again from zombies hitting and going through walls. -_-