Unable to Open Loot-Filled Pumpkin

Most issues with looting a Loot-Filled Pumpkin are caused by having a duplicate unique item in your inventory. 

If you are able to see what is in the pumpkin, check for a mask. Hallow's End masks are unique, which means for each type of mask (e.g. Goblin Male Mask or Female Human Mask), you can only have one in your inventory at a time. , use, sell or destroy the duplicate mask you have in your inventory. Once the other unique item has been disposed of, you will be able to loot the pumpkin.

If you are unable to the pumpkin, the issue is likely due to AddOn interference. Try updating out-of-date AddOns or disabling all AddOns. In the event that this doesn't fix the issue, try a full UI reset using the information in this article.