Dolphin, the GameCube and Wii emulator - Forums

Ok, I found it and it's definitely a bug. The problem starts with enabling "Pause on focus loss" option in the Config-Interface tab.
It looks like there is a new small window appears when a game starts(it wasn't in the previous builds) that get a focus from main window and causing this error.

I did name it portable.txt it does nothing

Oh I see but it still doesn't explain why having 2 gpus would cause black horizontal lines that wasn't in 5.0 7056.