Norton Website Image Blocking - Blank Images Issue

Found a very insightful article along with equally helpful comments here. Recently had a problem where a client's website was missing images when they viewed it on their Windows machines.

After lots of digging, turned out it was Nortons blocking the images because they had the word "banner" in the filename.

Lesson learned... don't name images with "banner" anywhere in the name otherwise Nortons may block them! Highly annoying!