I have been having this problem also. For the past couple of days whenever I search for the Camera Settings Challenge threads I get the same error message ...The only way I have found of accessing them is to scroll through the Discussion Boards page-by-page to find them.
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https://www.dropbox.com/s/mk4xg212boq2air/Screenshot%20from%202015-07-25%2020%3A00%3A06.png?dl=0
How does one report errors?