Can't select daily (champ) reward [CLIENT]

See images: Can see buttons, buttons are gone .The red circle represents where my mouse is roughly pointing at at the time of taking a screenshot. Now every time I log in, I get stuck on this screen. Can't click select, as it disappears the moment mouse gets too close to the option and can't select ok as I haven't selected anything. Only way out is to use the ESC key.

EDIT: The issue has been already reported before: Report, Report #2, Report #3

EDIT: Seems it's a difficult bug to deal with/find the source of, therefore I'll just leave the report here, although is was probably uneccessary to write it, as it seems to be a known bug now that happens to only selected few and can be worked around.