For those that are experiencing this, please supply at least a bit more info - was it working before, and now it's not (or are you completely new). If it was working before, did you change anything (add/or remove anything?)... have you tried shutting down and restarting Wow and HB... and if that didn't work, reboot your computer and try again.
These are basic steps you should try anytime you have a problem with the functionality of any program... try shutting it down and restarting it and if that doesn't work, reboot the computer completely, wait for it to stabalize and then try again.