Bitdefender GUI not showing up


Hi, I installed BitDefender on my PC, but I can't open the GUI. The BD Tray icon is gray and after I click on it, a window shows up saying "Bitdefender Sign in". So I typed in my BD account email and password, and then I clicked on "Sign In". But the tray icon is still gray and when I click on it, the "Sign in" Window shows up again. Pls help. (Sorry for my bad english).