Dual Spec can be purchased at level 40 for 50 Gold, allowing you to have a secondary talent tree. However, once you learn Dual Spec, there's an annoying bug that can occur whenever you log out.
For some reason, after you learn Dual Spec, you can randomly have some of your Action Bars reset after you log out. This doesn't always seem to be the case, and it can happen to different bars every time. While this doesn't affect combat capabilities, it can be annoying to log in and see a bar completely reset.
Screenshot Credit: Reloe. After logging in, the top-left bars are missing (Left Image) and have to be reimported (Right Image).
Due to this bug, many players have downloaded the Myslot addon. This addon was designed to help you save and import your UI across accounts, PCs, or on a new alt, but this addon has become very useful for filling your missing Action Bars every time they reset due to this bug.
