fix timeseries problem

org.eclipse.stem/core/org.eclipse.stem.solvers.stochastic/src/org/eclipse/stem/solvers/stochastic/impl/StandardStochasticImpl.java

diff --git a/org.eclipse.stem/core/org.eclipse.stem.solvers.stochastic/src/org/eclipse/stem/solvers/stochastic/impl/StandardStochasticImpl.java b/org.eclipse.stem/core/org.eclipse.stem.solvers.stochastic/src/org/eclipse/stem/solvers/stochastic/impl/StandardStochasticImpl.java
index c640c06..881a344 100644
--- a/org.eclipse.stem/core/org.eclipse.stem.solvers.stochastic/src/org/eclipse/stem/solvers/stochastic/impl/StandardStochasticImpl.java
+++ b/org.eclipse.stem/core/org.eclipse.stem.solvers.stochastic/src/org/eclipse/stem/solvers/stochastic/impl/StandardStochasticImpl.java
@@ -558,6 +558,12 @@
 	}
 	
 	private void copyCurrentToNext(IntegrationLabel iLabel) {
+		// SED FIX 2019/02/21. 
+		// Need to set tbhe next label valid so that notifications occurs on the GraphImpl switchToNextValue() call,
+		// or things like TimeSeries won't work.
+		
+		iLabel.setNextValueValid(true);
+		
 		IntegrationLabelValue iLabelValueCurrent = (IntegrationLabelValue)iLabel.getCurrentValue();
 		IntegrationLabelValue iLabelValueNext = (IntegrationLabelValue)iLabel.getNextValue();
 		iLabelValueNext.set(iLabelValueCurrent);