What is the pixel size of the pictures and what are the sequence settings?
Unless the images are of a higher resolution than the programme, they will do exactly that - bitmap image will get softer as you zoom into them as they only have a finite amount of pixels to show.
Camera Raw jpg
4256 x 2832 240dpi
PP seq 1440/1080
I have made it 72dpi & converted it to tif but still no good. I've had this many times in the past & I end up using Proshow Producer for pics then bring them into PP but dont want that any longer.
As you can see the image is plenty big enough
Do you have Default Scale To Frame Size turned on? If so, turn it off. Then reimport the images.
Thanks Todd, you nailed it!!!