First that I noticed it, I dropped a fishing hook on the ground and couldn't pick it back up. Even after relogging.
Next, my friend and I were killing infected and I couldn't hear his gun going off.
Then he tried dropping a gun for me and I could not see it. Relogging fixed the sound and allowed me to see and grab the gun he dropped.
Could not loot the inventory of a player I killed. Had to cut that player up to get the gun out of his hand.
Could not loot another player that fell into a closed shipping container after dieing. Even after cutting them up.