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
Component : Spectrum Core / SpectroSERVER
The OC server was upgraded in the middle of the primaries being upgraded so tomcat cache was off.
Cycle the Spectrum OneClick Tomcat process AFTER all primary SpectroSERVERs have been upgraded. This allows the cache to be rebuilt.