Why does every raster calcuation I try return with NAN values?

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I am trying to work with DEM rasters from the USGS using the raster calculator. I have tried to change the units from meters to feet using an expression such as:

"ned10m45111h8@1" * 3.28However this returns NAN values for every cell. I have also tried it without the quotes around the raster name as shown in this website: http://spatialgalaxy.net/2012/01/25/using-the-qgis-raster-calculator/

Similarly, I have tried the mask code:

("ned10m45111h8@1"
 
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