no explanation can be found, no meaning of the words appear

[kovgyorgyi]

Please inform how I can find some explanation of the grammar. At the beginning all new words had their meanings when I reached them by the mouse, it is not working any more, I have to check new words in a separate dictionary. Is something wrong with the settings? Also I cannot reach facebook from duolingo page as previously - but it is not so important for me.
Thanks in advance for your reply,
Best regards,
Georgina