[Bug] Weird black box displaying when validating quest

[Faile]

Date and Time : 09/08/2015

Game Control Mode (Keyboard/Joypad/Mouse) : Joypad

Where it happened (which map, which quest, which npc, etc) : Validating a quest with the healer lady (but it’s happening randomly when validating quests)

Bug Description :
When validating a quest, sometimes a black rectangle that takes almost half the screen is briefly displayed.

Steps to reproduce the issue :

1. Validating a quest with the healer lady
   but happenned more than once through lv 1 to 40+

Screenshots / Video :
https://dl.dropboxusercontent.com/u/14786416/screenshot_20150809_00002.jpg
https://dl.dropboxusercontent.com/u/14786416/screenshot_20150809_00004.jpg

System

• 2560x1080 resolution (ultra-wide)
• CPU : Intel® Core™ i7-4860HQ @ 2.40GHZ
• RAM : 32Go
• Graphics Card : NVidia Geforce GTX 980M
• Mainboard :
• Storage :
• OS : Windows 8
• Internet Connection :
• Country, Region :

[Faile]

For information, this is still up to date in CBT2.
I think it’s supposed to be a black screen fade when npcs appear/dissapear, but it’s not showing correctly on the whole screen but only on part of it.