Display Glitch when adding PNG as Picture to the viewport

bit of a display glitch, here. it seems as long as i add jpg its alright, when i start adding png (in that case transparent) it starts to glitch making the entire screen white and the images blue like so. as soon as you zoom in or out the glitch disappears.

ok after meddling around a bit more that is not fully repeatable, does not seem to matter if png or jpg, it does suddently appear when going to the desktop finder and drag and drop images in. also i am using exposé maybe that is part of it.