After installing 10.4 and launching webapp, it loads an empty grey screen. The following error is seen over and over in the $SPECROOT/webtomcat/bin/webswing.log:
[Webswing Process Handler] (SwingProcessImpl.java:281) [nulla3bd93df2d8OneClick Webapp] ERROR: ClientEventUpdate's static attrConfig member must be set
Release : 10.4
Component : Spectrum OneClick
The issue was resolved after a reboot.