I've noticed that my images have severe banding and posterization in the shadows when viewed 1:1 in the library module. This goes away and the images are clean in the Develop module. I'm running Lightroom CC 2015.6.1 under OSX 10.11.6, with plenty of memory. I created 1:1 previews at High Preview Quality level. FWIW these are Fuji XTRAN RAW files. Any thoughts?