I don't know if this has been reported, probably not. When using multiple monitors on linux (maybe on other os's too), the menus always show on the left most monitor. I am using ubuntu 14.04 LTS.
This issue is reported.
In ubuntu 14.04 with unity and using the proprietary driver NVIDIA version 331.113. When a OSD notification appears (like volume change or change of a song in rhythmbox) and the menu is open, then the menu starts to blink.
I get double char when i typing on keyboard in the address bar.
Ex: I pressed the key "s" on my keyboard - in address bar i see as "ss"
Blink: 537.36 (@2c4eb9b03dda59544bfe6f10f994c66411cf41c7)
(Linux Mint 17.1 Cinnamon 64-bit; Cinnamon v2.4.7; Linux Core 3.13.0-37-generic; Proc: Intel Core i7-3520M )