After upgrading Spectrum the OneClick tomcat log file - std.out or catalina.out shows this exception:
InstallationHistory is missing for the landscape: ss_3013
InstallationHistory is missing for the landscape: ss_3014
InstallationHistory is missing for the landscape: ss_3015
InstallationHistory is missing for the landscape: ss_3016
InstallationHistory is missing for the landscape: ss_3017
InstallationHistory is missing for the landscape: ss_3018
InstallationHistory is missing for the landscape: ss_3019
InstallationHistory is missing for the landscape: ss_3020
InstallationHistory is missing for the landscape: ss_3021
InstallationHistory is missing for the landscape: ss_3022
InstallationHistory is missing for the landscape: ss_3023
InstallationHistory is missing for the landscape: ss_1001
InstallationHistory is missing for the landscape: ss_1002
The OC server was upgraded in the middle of the primaries being upgraded so tomcat cache was off.
Component : Spectrum Core / SpectroSERVER
Cycle the Spectrum OneClick Tomcat process AFTER all primary SpectroSERVERs have been upgraded. This allows the cache to be rebuilt.