Screensaver bulletins not updating consistently

Some of the bulletins in of my zones is updating on all computers. I changed some information (i.e. employee birthdays) and the info is updated on my main channel. On some of the computers the same zone is not updating. What is odd is that it is updated fine on my computer's screen saver as well as the web preview but on my boss's computer the same zone is not updated and displaying old information.