This is problem which can sometimes effect you if you are using a Mac with an old version of the Mac OS (Operating System). The easiest fix seems to be to use a different web browser, such as Firefox or Google Chrome (both are free to download).

The problem doesn't appear to be confined to any particular browser, however simply switching to an alternative browser does, more often than not, fix the problem. If you are still experiencing the problem, you may need to update your Mac OS, or use a different computer.

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