diff --git a/src/gui/UBCachePropertiesWidget.cpp b/src/gui/UBCachePropertiesWidget.cpp
index 87285f61..7deb5232 100644
--- a/src/gui/UBCachePropertiesWidget.cpp
+++ b/src/gui/UBCachePropertiesWidget.cpp
@@ -92,7 +92,7 @@ UBCachePropertiesWidget::UBCachePropertiesWidget(QWidget *parent, const char *na
     mpSizeLabel = new QLabel(tr("Size:"), mpProperties);
     mpSizeSlider = new QSlider(Qt::Horizontal, mpProperties);
     mpSizeSlider->setMinimumHeight(20);
-    mpSizeSlider->setMinimum(0);
+    mpSizeSlider->setMinimum(50);
     mpSizeSlider->setMaximum(MAX_SHAPE_WIDTH);
     mpSizeLayout->addWidget(mpSizeLabel, 0);
     mpSizeLayout->addWidget(mpSizeSlider, 1);
diff --git a/src/tools/UBGraphicsCache.cpp b/src/tools/UBGraphicsCache.cpp
index af82f45d..62e1f0cc 100644
--- a/src/tools/UBGraphicsCache.cpp
+++ b/src/tools/UBGraphicsCache.cpp
@@ -105,7 +105,7 @@ void UBGraphicsCache::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
         }
         else if(eMaskShap_Rectangle == mMaskShape)
         {
-            path.addRect(mShapePos.x() - mShapeWidth / 2, mShapePos.y() - mShapeWidth / 2, mShapeWidth, mShapeWidth);
+            path.addRect(mShapePos.x() - mShapeWidth, mShapePos.y() - mShapeWidth, 2*mShapeWidth, 2*mShapeWidth);
         }
         path.setFillRule(Qt::OddEvenFill);
     }