I forgot, to also add that I did get a new computer too. I am using a macbook pro with retina display. I was using a macbook pro that is probably at least 6 years old running leopard I think 10.5.8... Thank you
Elements 13 supports Retina display, so ideally all thumbnails should look crisp and clear. However if it is a catalog created in older version of PSE, thumbnail regeneration takes a while running in the background. During this time, thumbnails might appear blurry. Please see if right click on the image > Update thumbnail resolves the thumbnail instantly.