diff --git a/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php b/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php
index 77f93e3..69fb2e7 100644
--- a/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php
+++ b/src/InputOutput/IHMImpl/Params/PlotImpl/IHMInputOutputParamsPlotClass.php
@@ -37,7 +37,7 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 		{
 			$resetZoom = true;
 			//save request
-			$this->saveIHMRequest($input);
+			$this->saveIHMRequest(PLOT_RESULT_FILE_KEY."_".$input->{'tab-index'}, $input);
 		}
 			
 		//Request
@@ -1448,9 +1448,9 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 		return "[".$r.",".$g.",".$b."]";
 	}
 	
-	private function saveIHMRequest($input)
+	private function saveIHMRequest($interactiveId, $input)
 	{
-		$path = $this->getWorkingPath()."ihm.request";
+		$path = $this->getWorkingPath()."ihm.request.".$interactiveId;
 		if (!is_dir($this->getWorkingPath()))
 			mkdir($this->getWorkingPath(),0777);
 		$file = fopen($path, 'w');
@@ -1458,9 +1458,9 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 		fclose($file);
 	}
 	
-	private function loadIHMRequest()
+	private function loadIHMRequest($interactiveId)
 	{
-		$path = $this->getWorkingPath()."ihm.request";
+		$path = $this->getWorkingPath()."ihm.request.".$interactiveId;
 		if (!file_exists($path))
 			return NULL;
 		return json_decode(file_get_contents($path));
@@ -1470,7 +1470,7 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 	{
 		$actionInput    = $input->{'action'};
 		
-		$plotInput = $this->loadIHMRequest();
+		$plotInput = $this->loadIHMRequest($actionInput->{'interactiveId'});
 		
 		if (!isset($plotInput))
 			throw new Exception('Cannot retrieve request input for interactive action.');
@@ -1723,22 +1723,8 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 	
 	private function unmarshallNavigation($input, $plotInput)
 	{
-		//Find current tab
-		$crtTab = NULL;
-		foreach ($plotInput->{'tabs'} as $tab)
-		{
-			if ($input->{'tabId'} == PLOT_RESULT_FILE_KEY."_".$tab->{'id'})
-			{
-				$crtTab = $tab;
-				break;
-			}
-		}
-		
-		if (!$crtTab)
-			throw new Exception('Cannot retrieve plot tab for navigation action.');
-		
-		$startTime = $crtTab->{'startDate'};
-		$stopTime = $crtTab->{'stopDate'};
+		$startTime = $plotInput->{'startDate'};
+		$stopTime = $plotInput->{'stopDate'};
 		
 		//Compute new start / stop time
 		date_default_timezone_set('UTC');
@@ -1781,12 +1767,11 @@ class IHMInputOutputParamsPlotClass extends IHMInputOutputParamsAbstractClass
 		$stopTime = date("Y-m-d\TH:i:s",$stopTimeStamp);
 		
 		//Update request
-		$crtTab->{'startDate'} = $startTime;
-		$crtTab->{'stopDate'} = $stopTime;
+		$plotInput->{'startDate'} = $startTime;
+		$plotInput->{'stopDate'} = $stopTime;
 		
-		$plotInput->{'last-plotted-tab'} = $crtTab->{'id'};
 		$plotInput->{'force-time-zoom-reset'} = true;
-		$this->saveIHMRequest($plotInput);
+		$this->saveIHMRequest($input->interactiveId, $plotInput);
 		return $plotInput;
 	}
 	
--
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