Multiply Blend Mode Causing Issues

If I were to add a drop shadow to an object, it defaults to multiply which gives the best effect. But in the last 2 weeks or so it started doing this......

If there is another object behind the drop shadowed layer it causes this effect. Only blend mode that does not do this is Normal. I have tried to uninstall and reinstall, no luck there. Also if I save the file it looks completely normal, this only happens in Illustrator CC

My PC Specs are: 24GB of DDR3 1866, AMD FX 8300 Series 8 Core Processor, Gigabyte R9 285 Graphics Card.