Please accept my sincere apologies for any inconvenience that you might have experienced. You may be experiencing a java error on your browser that is causing your browser not to open your folders through the AT&T powered by Yahoo. This can be resolved by updating your browser as well as the addons. You may also try to access your AT&T powered by Yahoo! e-mail using another type of browser like Google Chrome or perhaps Mozilla Firefox.
Should you need further help regarding your post, please feel free to reply on this thread.
For quick answers, make the new AT&T Help site your first stop. Visit http://www.att.com/esupport/ where you'll find pages of product information to assist you.