Depending upon your web browser settings, the browser may not load the most current version of a web page. This is because a web browser may save images and text from a web page into what is called a web browsers cache. The purpose of the cache is to store commonly accessed web page items to improve speed of web browsing for people on slower connections, and to enable browsing of pages when people are offline.
If you're experiencing a problem viewing a web page (particularly an interactive one), you may need to "clear your cache". If you call technical support for assistance with a problem, they may recommend this as well.
If you think these stored images and text files are causing problems, or just want to ensure you're not viewing obsolete web pages, you should clear your cache. (Note that Internet Explorer refers to this as "deleting temporary Internet files").