We have confirmed this is happening in some cases.  As far as we can tell, this was not something we were able to make happen on our internal server.  It appears to be something that only occurs on the live worlds. From talking to Sev, it seems to have something to do with the amount of memory used on live as compared to the test world.  We have in the past spoken about the difficulties we have duplicating the exact conditions of the live worlds, and unfortunately this appears to be one of those rare cases where the difference between the two worlds was enough to cause different results.

Players can resolve this by "breaking" the interaction on the corpse in question.  The simplest way to do this is to get far enough away from the corpse that is trying to be looted, so that the interaction is broken.  After that, players should be able to go back and loot the corpse.

We are going to gather some more information about this and decide what our next move will be.  Once we know more, I will let everyone know.

Please note that if you are using any third party applications to loot for you, it may increase the frequency of this occurring.

EDIT: Update with some more information.

If you die and you cannot loot your own corpse due to this issue, please submit a ticket via Urgent Assistance.  A member of our CS staff will get to you as soon as they can.

Please note this does not apply to PK kills.  Our CS folks will not be able to go in and open the corpse of another player you may have killed.

The only other option we can suggest at this time is to keep trying to open the creature kills that get in this state.