All Pharmaceutical Press web products are updated periodically.
When websites are upgraded, your web browser (e.g. Internet Explorer, Firefox, Google Chrome or Safari) should use the updated version. But these browser applications store (“cache”) the web pages that you visit on your local computer to speed things up the next time you open the same page. Some browsers exploit caching more extensively than others.
A possible consequence is that, if the program code of a website is updated by the hosts and you interact with an updated piece of code by an action (say, a click or a data entry) which forwards you to another page, your browser may take you to an old copy of that page held in its cache and you have a mismatch. The new code won’t work properly and you will probably see errors on the page.
If you have the home page stored and the login process code is updated, you may find that you cannot even login.
Refreshing a page may correct a particular display error, but to solve the problem properly, you need to clear out all the old pages from that website that are stored on your computer. This is explained in numerous articles on the web, such as those at
Note that you do not need to download any software tools to help in this, even if such sites offer them.
A trickier problem to trace arises when your computer is on an organization’s network and your organization uses a proxy server to store web pages that you visit in a cache that is separate from your own PC's cache. You probably won’t know that this is happening, but you will need to check with your IT department.