Comment # 2 on bug 981358 from Robby Engelmann

I do not think that flickering in menus only sometimes is the same like
flickering throughout the whole desktop everytime. I would guess that this time
the xcb-update in the not yet released 20160523 is to blame.
On my system all other "flickering" was resolved since 20160520 with 4.6 kernel
from Kernel:stable repo.