In QGIS, when I change from single symbol to a graduated style, the map "disappears." When I change it back to single symbol, the map "reappears." The issue doesn't appear to be the scale, since it remains unchanged. When I copy the layers into ArcMap, there is no problem. What is causing this problem?

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    don't forget to choose a field to base the classification on, then hit 'classify'... – DPSSpatial Sep 30 '15 at 20:12
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    Welcome to gis.stackexchange! Please edit the title of your question to include enough information for future visitors to be able to find this thread when looking for the same problem. – underdark Sep 30 '15 at 20:26

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