finding that some images are displaying as white noise
Chris.
What you are seeing is the low quality of the thumbnails only.
You can improve the quality by clicking VIEW, Thumbnail File Browser, Thumbnail Quality and select highest.
Just for information, this same thumbnail is used to show the preview panel at the upper right of the main screen so that will reflect the quality setting as well.
If you go into the Full Page editor screen, again you can set that for speed (low rez) or HQ High Quality by selecting Thumbnail small images, or ALL images.
If you hover the mouse over a thumbnail and tap the spacebar, you will get a High quality image of that same noisy thumbnail.
Fred