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.