Any effect applied to a clip creates a purple tint on the whole image once rendered in timeline

Hello,

It seems that every time I throw in any effect (flip, blur, etc) inside a clip and I render that clip, it creates a purple tint over the whole video. 
Could someone explain what's going on? 

The first 'black' image has no effects applied, the second has a camera blur effect. 

Your help would be greatly appreciated.

Thank you,

Thanos