Just go to World of Warcraft\WTF\Account\AccountName\SavedVariables and look for the files with WeakAuras in it's name and delete them. That is going to delete any changes you made to the addon. I don't think a clean install is needed.
If you are using the curse client, you can right-click an addon and select delete saved variables to achieve the same thing.
Originally Posted by DeadmanWalking
Your forgot to include the part where we blame casuals for everything because blizzard is catering to casuals when casuals got jack squat for new content the entire expansion, like new dungeons and scenarios.
Originally Posted by Reinaerd
T'is good to see there are still people valiantly putting the "Ass" in assumption.