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My experience is that the most common problem when people can't copypaste things to a cachepage is that they are in WYSIWYG-mode instead of HTML-mode so I will assume that this is what you are having a problem with. If you have copied the strings that starts with <a href for your challenge checker and want them in your cache description you need to be in HTML-mode to paste it into the description.You change the mode by clicking the button with the text "</> Source", when the button is green with white text you can paste the challenge checker-linkstuff in the cache description. When the button is white with green text you can not do that.
