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I've just added Chapman's Green in London N22 and it all looks okay when I save and it appears in search just fine, but the name doesn't show on the map and it hasn't blocked the area in green.
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Not to worry, looks fine to me. This is usually caused by your browser caching the old tiles. A Shift-F5 should force the cache to be cleared. Another approach is to toggle to the Humanitarian layer which because it has a less complex stylesheet usually refreshes after a chance a bit faster (but you may have to zoom in/out to cause tiles to render at all).
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