after all the updates, the bug is still there, and i believe it's the same bug as

https://bugzilla.redhat.com/show_bug.cgi?id=626852

anyway, as joachim backes kindly suggested,

yum downgrade at-spi2-atk

fixed the problem, for now.

--
Among the maxims on Lord Naoshige's wall, there was this one: "Matters of great concern should be treated lightly." Master Ittei commented, "Matters of small concern should be treated seriously."
(Ghost Dog : The Way of The Samurai)