I have had the same issue for about two weeks now. I posted a thread on here as well as Discord along with opening a ticket. There are several other threads reporting the same issue (linked below). The common aspect seems to be the last Star selection causes the game to blur and freeze. Several have noted that Ysera is one of the leader stars about to appear when the game freezes.
I was able to find a temporary workaround for the star blurred screen issue.
When you first open the game wait for the star selection tome to pop up. Once the star selection tome has popped up, do not select any stars, instead select your player name/avatar.
At this point select the gear icon (settings icon) and logout, then log back into the game.
You should be able to play the game from this point; however, note that once you close the game application and reopen the app, you will have to take the same steps each time (log out then log back in) you reopen the app (at least until the bug is fixed).
Please note, be sure you have the game linked to BattleNet account before logging out.
Links to other threads reporting the same issue: