If the rest of the page is working ok then why worry?
The reason is to do with the settings of your computer. In order to prevent web pages observing your browsing the bit of the page concerned is disabled. You may find, for example that e-mails containing html will have a note at the top saying that certain parts of the page have been disabled, and some items will merely have a small red x in the corner
Among the bits and bobs that will arrange this are SP2, internet explorer privacy settings, zone alarm and many flash killers included with Spybot, Ad-aware etc
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