<p>Maybe it only shows up for certain background imagery sources?   <a href="https://github.com/tomhughes" class="user-mention">@tomhughes</a> can you send me the url that you are trying this so that I can see the background / zoom / lng / lat?</p>

<p>Can you also try it here and see if you get the same error?<br>
<a href="http://openstreetmap.us/iD/master">http://openstreetmap.us/iD/master</a></p>

<p>Thanks!</p>

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