diff --git a/analysis/particleCharacterization.py b/analysis/particleCharacterization.py
index 5cadb33f4a1a97387e5b891576870af04cb549d4..7922ea3832c82042df74204e6b91a3b7882f9a03 100644
--- a/analysis/particleCharacterization.py
+++ b/analysis/particleCharacterization.py
@@ -74,10 +74,7 @@ def getParticleColor(imgRGB, colorClassifier=None):
 def getParticleShape(contour, particleHeight, shapeClassifier=None):
     if shapeClassifier is None:
         shapeClassifier = ShapeClassifier()
-    try:
-        shape = shapeClassifier.classifyShape(contour, particleHeight)
-    except InvalidParticleError:
-        raise
+    shape = shapeClassifier.classifyShape(contour, particleHeight)
     return shape
 
 def getParticleHeight(contour, dataset):
diff --git a/analysis/particleClassification/shapeClassification.py b/analysis/particleClassification/shapeClassification.py
index a6c9fe9de17725112a9b07776438b7bbbd7ffd1d..f5e528a2345db7cc64da8da97c5bf4724ee15e2e 100644
--- a/analysis/particleClassification/shapeClassification.py
+++ b/analysis/particleClassification/shapeClassification.py
@@ -50,10 +50,7 @@ class BaseShape(object):
             
         self.solidity = area/hull_area
         
-        try:
-            long, short = self.getEllipseOrBoxLongAndShortSize()
-        except InvalidParticleError:
-            raise InvalidParticleError
+        long, short = self.getEllipseOrBoxLongAndShortSize()
         self.aspectRatio = long/short
         
         avgLength = (long+short)/2
@@ -138,10 +135,7 @@ class ShapeClassifier(object):
         newShape = BaseShape()
         newShape.contour = contour
         newShape.height = particleHeight
-        try:
-            newShape.getParticleCharacteristics()
-        except InvalidParticleError:
-            raise InvalidParticleError
+        newShape.getParticleCharacteristics()
         
         mostFittingCriteria = 0
         bestFittingShape = 'unknown'
diff --git a/analysis/particleContainer.py b/analysis/particleContainer.py
index 43acc08bc7879ffdb137c59fc192d25dca6f93d2..8875f289d5c952ebcf3b76a7395ed6dc3a8c7e4d 100644
--- a/analysis/particleContainer.py
+++ b/analysis/particleContainer.py
@@ -134,23 +134,17 @@ class ParticleContainer(object):
             
     def applyAssignmentListToParticleMeasurements(self, assignmentList):
         '''AssignmentList is list of spectra assignments in order of spectra indices'''
-        indicesOfTransferredAssignments = [None]*len(assignmentList)
-        for particle in self.particles:
-            for meas in particle.getMeasurements():
-                scanIndex = meas.getScanIndex()
-                meas.setAssignment(assignmentList[scanIndex])
-                indicesOfTransferredAssignments[scanIndex] = scanIndex
-        assert not None in indicesOfTransferredAssignments
+        assert len(assignmentList) == len(self.measurements), f'assertion error in assignment of results: {len(assignmentList)} results for {len(self.measurements)} spectra...'
+        for meas in self.measurements:
+            scanIndex = meas.getScanIndex()
+            meas.setAssignment(assignmentList[scanIndex])
     
     def applyHQIListToParticleMeasurements(self, hqiList):
         '''HQI-List is list of spectra hqis in order of spectra indices'''
-        indicesOfTransferredHQIs = [None]*len(hqiList)
-        for particle in self.particles:
-            for meas in particle.getMeasurements():
-                scanIndex = meas.getScanIndex()
-                meas.setHQI(hqiList[scanIndex])
-                indicesOfTransferredHQIs[scanIndex] = scanIndex
-        assert not None in indicesOfTransferredHQIs
+        assert len(hqiList) == len(self.measurements), f'assertion error in assignment of hqis: {len(hqiList)} results for {len(self.measurements)} spectra...'
+        for meas in self.measurements:
+            scanIndex = meas.getScanIndex()
+            meas.setHQI(hqiList[scanIndex])
     
     def reassignParticleToAssignment(self, particleIndex, newAssignment):
         particle = self.getParticleOfIndex(particleIndex)
diff --git a/sampleview.py b/sampleview.py
index af29d9b7ff5fe8f6138f096b38bdda514468d5e2..89116fb22d16dea08119173647e3ecb19fde7254 100644
--- a/sampleview.py
+++ b/sampleview.py
@@ -81,7 +81,7 @@ class SampleView(QtWidgets.QGraphicsView):
         self.boundaryitems = [[],[]]
         self.scanitems = []
         self.ramanscanitems = []
-        self.particleInfoBoxes = []
+        self.particleInfoBox = None
         self.imgdata = None
         self.isblocked = False
         self.contourItems = []
@@ -387,26 +387,19 @@ class SampleView(QtWidgets.QGraphicsView):
             cnt.update()
             if cnt.particleIndex not in self.selectedParticleIndices:
                 self.selectedParticleIndices.append(cnt.particleIndex)
-                addParticleInfoBox(cnt.particleIndex)
+#                addParticleInfoBox(cnt.particleIndex)
                 
         def removeContourFromSelection(cnt):
             cnt.isSelected = False
             cnt.update()
             self.selectedParticleIndices.remove(cnt.particleIndex)
-            removeParticleInfoBox(cnt.particleIndex)
+#            removeParticleInfoBox(cnt.particleIndex)
         
-        def addParticleInfoBox(index):
-            newInfoBox = ParticleInfo(self.dataset.particleContainer.getParticleOfIndex(cnt.particleIndex))
-            self.particleInfoBoxes.append(newInfoBox)
-            self.scene().addItem(newInfoBox)
-            self.update()
-        
-        def removeParticleInfoBox(index):
-            for infoBox in self.particleInfoBoxes:
-                if infoBox.particle.index == index:
-                    self.scene().removeItem(infoBox)
-                    self.particleInfoBoxes.remove(infoBox)
-            self.update()
+        def updateParticleInfoBox(index):
+            if self.particleInfoBox is not None:
+                self.scene().removeItem(self.particleInfoBox)
+            self.particleInfoBox = ParticleInfo(self.dataset.particleContainer.getParticleOfIndex(index))
+            self.scene().addItem(self.particleInfoBox)
             
         p = self.mapToScene(event.pos())
         p = QtCore.QPointF(p.x(), p.y())
@@ -428,8 +421,13 @@ class SampleView(QtWidgets.QGraphicsView):
                     cnt.update()
                     if cnt.particleIndex in self.selectedParticleIndices:
                         self.selectedParticleIndices.remove(cnt.particleIndex)
-                        removeParticleInfoBox(cnt.particleIndex)
-                    
+
+        if len(self.selectedParticleIndices) > 0:
+            updateParticleInfoBox(self.selectedParticleIndices[-1])
+        else:
+            self.scene().removeItem(self.particleInfoBox)
+            self.particleInfoBox = None
+            
         self.update()
 
     def scaleImage(self, factor):
@@ -499,7 +497,7 @@ class SampleView(QtWidgets.QGraphicsView):
                     self.item.setOpacity(1)
 
             else:
-                self.item.setPiparticleInfoBoxesxmap(QtGui.QPixmap())
+                self.item.setPiparticleInfoBoxxmap(QtGui.QPixmap())
             if self.mode == "OpticalScan":
                 for i, p in zip(self.dataset.fitindices, self.dataset.fitpoints):
                     p = self.dataset.mapToPixel(p, mode=microscope_mode, force=True)
@@ -616,12 +614,11 @@ class SampleView(QtWidgets.QGraphicsView):
         self.contourItems[index].isSelected = True
         self.selectedParticleIndices =[index]
         
-        for infoBox in self.particleInfoBoxes:
-            self.scene().removeItem(infoBox)
+        if self.particleInfoBox is not None:
+            self.scene().removeItem(self.particleInfoBox)
         
-        newInfoBox = ParticleInfo(self.dataset.particleContainer.getParticleOfIndex(index))
-        self.particleInfoBoxes = [newInfoBox]
-        self.scene().addItem(newInfoBox)
+        self.particleInfoBox = ParticleInfo(self.dataset.particleContainer.getParticleOfIndex(index))
+        self.scene().addItem(self.particleInfoBox)
         self.update()
         
     def centerOnRamanIndex(self, index, centerOn=True, highlightIndex=True):