This can easily be resolved by using a Dispatcher.BeginInvoke to delay the adding of the element. 

The fix is available in LIB Version: 2014.3.1402.

"Insert" operation is not supported properly for chart series but is handled like "Add" i.e. RadCartesianChart.Series.Insert(0, series) will not result in inserting the series at zero index but internally it will be added to the end of the collection and it will be treated as last series.

Available in version 2014.3.1215.

RadPieChart labels are clipped when RadiusFactor is 1.0

The StrokeDashArray property is no applied when you set it on the Path element in the StrokeShapeStyle of a line series

Fixed in Q3 2014

In a chart that displays more than one series, it would great to be able to turn on/off the trackball feature on a per-series basis. (Currently, suppressing the display of data for a given series doesn't prevent the trackball from snapping to points on that series - a weird experience for the user.

Missing annotation when the chart is placed inside TabControl and its PanZoomBars are collapsed through an implicit style. The annotation is displayed after resize or any other action that triggers redrawing of the control.

As a side note, this behavior occurs only if there is no pan and zoom behavior added in the Behaviors collection of the chart.

Fixed in Q3 2014

If you set the PolarAxis.Maximum property to value which is equal to or less than the smallest value of a series, a DevideByZero exception is thrown.

Fixed in Q3 2014

All labels of the LogratihmicAxis display 'zero' in scenarios with small values  (for example: 0.000000000116 or 2.3E-10)

When the ItemsSource of a series is replaced with new collection, the labels of the old series are not cleared.

Fixed in LIB version: 2014.2.714

When the LabelTemplate property of the chart's axis is changed at runtime the labels are not resized and they overlap the plot area if they are too long.

Fixed in 2014.2.0630 LIB

NullReferenceException on updating data when mouse is over chart's area and trackballinfo is visible. 

To workaround this, remove the TrackBallBehavior when data is updated and add it again on MouseMove.

RadPieChart throws an exception whenever is in a DataTemplate of an ItemsControl with over 120 instances. The ItemsControl uses a RadUniformGrid as an ItemsPanel. Project is attached.

Chart is not exported properly when Margin is present.

When adding two BarSeries in code-behind, the second one is not aligned well on the horizontal DateTimeContiniousAxis. It starts from the beginning of the axis, but not the supposed DateTime.

Bar series with DateTimeContinuousAxis axis with no MajorStep specified. When you zoom the bars gets to big and does not stay within its tick boundaries.

DateTimeContinuousAxis produces too many labels when zoom in to the max and then zoomed out with double clicking the slider. The result is different when zooming out while dragging the slider and when double clicking it.

The ToolTip's style is missing in the no xaml assemblies in Expression_Dark and Office2013 themes. A work-around is to manually include the tool tip's style (for example in the App.xaml).