There is a defect in the python code for Combat Sentinel II and III. Here is an attempt at a fix. Use this file in place of CvAfterworldEvents.py. Obviously, back up your present file before trying this.
Code:
iSpawnTimerValue = pUnitData.getSpawnTimer()
iSpawnTimer2Value = pUnitData.getSpawn2Timer() #defect fix
iSpawnTimer3Value = pUnitData.getSpawn3Timer() #defect fix
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if iSpawnTimerValue > 0:
pUnitData.changeSpawnTimer(-1)
if iSpawn2TimerValue > 0:#defect fix
pUnitData.changeSpawn2Timer(-1)
if iSpawn3TimerValue > 0:#defect fix
pUnitData.changeSpawn3Timer(-1)