Random blocking or issues with rendering webpages

Having intermittent, seemingly more users complaining about pages not displaying properly, two sites that always act up:

CNN.com
Amazon.com

All page formatting is messed up like the CSS is missing, sometimes a number of F5's to refresh the page displays, other times it will not work full stop but the next day it will.

Turning off Web Protection resolves the issue immediately so something is being blocked but I cannot figure out what and how to resolve based on the random behaviour.

Screen shot of how CNN.com pages are being rendered today......

Thanks for any insight anyone can provide!

Chris

Attached Images

cnn screenshot.jpg (24.2 KB)