How can I tell if the problem I am having is a bug?

Issues that only affect one of your characters or only characters on your account are usually not bugs. For example, if your client crashes while entering a certain area on one of your characters wow gold, but not for anyone else, chances are this is an issue with your WTF, Interface, and WDB folders, and can be resolved by simply going to your World of Warcraft folder and deleting them.