I have SNAP v. 6.0 updated as of today. and I am getting the java.lang.NullPointerException error upon trying to view imported Planet 3m data (doesn’t matter if it is AnalyticMS or the AnalyticMS_SR). I can load the file, but I cannot view a band nor view a single band nor RGB image view (which gives ‘The RGB image view could not be created’ error). I get an error with either method. I have no problem loading nor manipulating the same data in ArcGIS, for example, so its not a data problem.
I just mentioned this in here in case it works for you as well,