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Try a forced refresh or clear your cache...

I have this problem with my Windows phone. At the risk of looking dim, how would I go about the options you suggest?

It depends a bit on the version of your Windows phone operating system and Internet Explorer version (assuming you're using Internet Explorer).

One or more of these links may help:

http://refreshyourcache.com/en/windows-phone/

https://kb.wisc.edu/page.php?id=24078

More general: http://www.wikihow.com/Force-Refresh-in-Your-Internet-Browser