When you say blank, is the expected content missing, or are some of the 
normal map controls also missing?  For recent releases of geoServer it 
seems that the system has a new/different dependency for the OpenLayers 
library used for preview - if you are accessing geoServer via a proxy, 
you will need a new path to be recognized that routes this traffic to 
the appropriate tomcat.  I ended up adding (for apache httpd)

     ProxyPassMatch ^/openlayers3/(.*)$ 
ajp://localhost:8009/geoserver/openlayers3/$1

I'm not sure if this is a bug in geoServer (Windows builds), or some 
other underlying change (tomcat, ....), but either the system is now 
expecting a distinct (root dir) install of openlayers, or part of the 
path was omitted by geoserver in its calls.  I haven't checked this for 
direct tomcat use (no proxy), but suspect even there the shortened path 
will cause issues.


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