I was playing Season 20 and could follow up to 9/10 achievements. Suddenly, the season journey screen (shift+j) got blank, and even the link button on the start game screen just desapear. So, everything was fine and gone later on!!
Reinstall the game, deleting the Battle.net cache folder, turning off anti-virus, and trying on a different computer didn’t work. Some advice? Thx all =*