[Qgis-user] Selected raster is not 8bits formated - QGS 2.16.2

[Hydro Spheric]

After upgrading to QGIS 2.16.2 I get the following error (spelling error not mine) when opening a geotiff file:
"Selected raster is not 8bits formated" 
The file opens fine however. 

When adding more rasters the file sometimes does, and sometimes doesn't pop up.
When closing the project the same error pops up for each open raster.

Is this a bug, and if so how can I report it?
Thanks,Bart
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