Going into the Portal from many devices with same Virtual MAC will cause problems! If you want to use the Portals with other apps at the same time make sure you have a separate account for this. And make sure you login ONLY with Smart STB. After that ask them to RECREATE your account. Solution: ask your Provider to DELETE your account from the Portal. We recommend putting in the direct URL to the Portal.
Sometimes Portal redirect will cause this due to limitations of some Smart TV platforms.Smart STB gets black (white/grey) screen after 'Loading Portal'? Sometimes you may get white screen, grey screen, etc.