Visual artifacts on desktop after using ShadowPlay

[Matjo]

I get these artifacts after closing/alt-tabbing a game whilst ShadowPlay is activated (I don't have to record for them to appear). 

 

I tried to format my PC, but that didn't help. It happened on my GTX660Ti, and still does on my GTX970.

I really like ShadowPlay, so I would prefer to find a solution other than turning it off, But I will of course do that if that's what it takes to stop it.

I have also tried to reinstall drivers and GeForce experience, but to no effect.

 

CPU: i7 2600k (cooled with H80)

Motherboard: ASUS P67 Sabertooth
RAM: Kingston DDR3 HyperX 1600MHz (4x4)
GPU: ASUS STRIX GTX 970
PSU: Corsair HX750

 

Please save me and my HDD's from recording hell. Thank you.

[niofalpha]

Are you overclocking at all?

[Matjo]

I have had my CPU at the same clock for the last year without any problems and at a steady temperature.

The computer seems the same otherwise, so I wouldn't guess that it was the CPU. Could I be wrong?

[tmlhalo]

I think Niofalpha was talking about overclocking your graphics card. Which is still a valid question. Does turning it off fix the issue or do they still appear while Shadowplay is off? Also is your card getting good cooling? What are the thermals while idle and while playing?

[Matjo]

Sorry, I meant to say that the only thing I have OC'd is the CPU. The GPU is untouched. It's at 33 idle and climbs to about 50-60 whilst playing.

As I said in the OP, turning ShadowPlay off fixes the issue.