Opening Multiple Images video issue

Just noticed something when selecting around 8 images ranging in size between 2-3 MB and choosing Open With in Pixelmator (not sure if this is app related or not). Half way through opening the batch, the rest will be just dark images. When starting to close some, the next one may be checkerboard but no image showing. This is on my brand new (refurbished) early 2015 MBP 13 inch. Should I be concerned with this as it might be a video card issue?

Note: Just tried opening 15 in GraphicConverter and had no such issue at all. Must be app related?

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