With each new patch changes are made to the blizzard UI that can break third party UI mods and cause any number of problems in the client. Before you report a bug, please disable (or delete) all of your mods and test the situation again. If the issue does not happen without mods installed then it is not a WoW bug and you should contact the mod creator for further assistance.
How do I know that I’ve found a bug?: If you think you’ve found a bug at all, you should report it. In the worst case, you have actually found a bug, and in the best case, someone will point out that what your experiencing is intended functionality and will (hopefully) explain how to avoid the issue that you’re experiencing. Often, bugs will go unreported because people aren’t sure if it is “worth” reporting. The fact of the matter is that *every* bug is worth reporting. What just looks like a small graphic error may actually be a quest item underground or a hole in the map. You’re making the game better by reporting issues that you’ve noticed. As a side note, custom user interfaces can cause a variety of issues with the game, so please try to verify that the bug occurs without any custom UI mods loaded.