RC2, added the version to the support us and help pages, so we can show that the user is using an outdated version.

Greenshot/Drawing/Fields/AbstractFieldHolderWithChildren.cs

@@ -31,9 +31,10 @@ namespace Greenshot.Drawing.Fields
 	/// but has a List of IFieldHolder for children.
 	/// Field values are passed to and from children as well.
 	/// </summary>
-	[Serializable()]
+	[Serializable]
 	public abstract class AbstractFieldHolderWithChildren : AbstractFieldHolder
 	{
+		[NonSerialized]
 		private readonly FieldChangedEventHandler _fieldChangedEventHandler;
 
 		[NonSerialized]

Greenshot/Drawing/Fields/FieldAggregator.cs

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+using System;
 using Greenshot.Configuration;
 using Greenshot.IniFile;
 using Greenshot.Plugin;
@@ -40,6 +41,7 @@ namespace Greenshot.Drawing.Fields
 	///    Properties that do not apply for ALL selected elements are null (or 0 respectively)
 	///    If the property values of the selected elements differ, the value of the last bound element wins.
 	/// </summary>
+	[Serializable]
 	public sealed class FieldAggregator : AbstractFieldHolder
 	{
 

Greenshot/Drawing/Filters/AbstractFilter.cs

@@ -31,7 +31,7 @@ namespace Greenshot.Drawing.Filters {
 	/// Subclasses should fulfill INotifyPropertyChanged contract, i.e. call
 	/// OnPropertyChanged whenever a public property has been changed.
 	/// </summary>
-	[Serializable()]
+	[Serializable]
 	public abstract class AbstractFilter : AbstractFieldHolder, IFilter {
 		
 		[NonSerialized]