Prior to owing my new tablet I had one of the original nooks and was able to use pdf files with out problem. The thing is that with my new tablet I've notice a problem with PDF files both the onboard software and acrobat have this problem. Every time I scroll down the it has to (refocus? it seems to be more like back in the day with 56k modem when you load a pic the image is blocky then it sharpens up that's what happens.) Could this be just be how PDF's are with mobile devices or is it more of a hardware issue. I have a brand new ASUS Transformer TF300T so I don't think its hardware. Please any help would be most appreciated. ^.^