Not sure yet whether the cause is 20918 or 20917 but I am getting debug logs on launch.
net.sourceforge.kolmafia.swingui.ItemManageFrame could not be loaded
class java.lang.reflect.InvocationTargetException: null
net.sourceforge.kolmafia.swingui.ItemManageFrame could not be loaded
class java.lang.IndexOutOfBoundsException: Invalid range
net.sourceforge.kolmafia.swingui.SkillBuffFrame could not be loaded
class java.lang.reflect.InvocationTargetException: null
net.sourceforge.kolmafia.swingui.SkillBuffFrame could not be loaded
class java.lang.IndexOutOfBoundsException: Invalid range
Edit: Does not happen in r20916.
net.sourceforge.kolmafia.swingui.ItemManageFrame could not be loaded
class java.lang.reflect.InvocationTargetException: null
net.sourceforge.kolmafia.swingui.ItemManageFrame could not be loaded
class java.lang.IndexOutOfBoundsException: Invalid range
net.sourceforge.kolmafia.swingui.SkillBuffFrame could not be loaded
class java.lang.reflect.InvocationTargetException: null
net.sourceforge.kolmafia.swingui.SkillBuffFrame could not be loaded
class java.lang.IndexOutOfBoundsException: Invalid range
Edit: Does not happen in r20916.