Just for those of you unsure, BigWigs was updated on our site on the 15th. Clicked the wrong button this evening in Gruul's and my version is not a stable one, its got 2.4 Sunwell stuff in it and its always changing 4-5 times a day =P
The one on our site is stable from before they started incorporating Sunwell encounters.
I make sure to test the packaged addons on our site as best as I can before I upload them for updates to make sure they arent loaded with errors. If its been some time since you updated BigWigs, I would urge you to do so regularly, every update generally improves the warnings and alerts more from the last versions and accounts for any changes from hotfixes applied by Blizzard.