Under Buffered Rendering, selecting Read Framebuffers to Memory disables the red overlay. 
But it also makes it terribly slow on my tablet. Then again, it's really slow under every setting.
But it also makes it terribly slow on my tablet. Then again, it's really slow under every setting.
Devices:
Samsung Galaxy Tab 2 7 - Stock 4.1.1
PC:
Intel Core 2 Duo CPU E6850 @ 3.00GHz
AMD Radeon HD 5450
Samsung Galaxy Tab 2 7 - Stock 4.1.1
PC:
Intel Core 2 Duo CPU E6850 @ 3.00GHz
AMD Radeon HD 5450