I have experienced this on numerous servers. Kill a mob, box drops, either it wont open or it opens but it cant be looted. Anyone else having this problem? I know occasionally this happens, but in recent weeks it seems to me it is gaining in frequency. On one dissapointing instance ( and there have been many), saw an IB +1 drop from a Golem, but could not loot the item out of the box.
i have reported it to KO "bug report" but have yet to receive a response.