A bit of refactoring to be able to find some issue...

GreenshotPlugin/Interfaces/Capture.cs

@@ -18,11 +18,12 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 using System;
 using System.Collections.Generic;
 using System.Drawing;
 
-namespace Greenshot.Plugin {
+namespace GreenshotPlugin.Interfaces {
 	/// <summary>
 	/// The capture mode for Greenshot
 	/// </summary>

GreenshotPlugin/Interfaces/Drawing/Adorners/IAdorner.cs

@@ -23,7 +23,7 @@ using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Windows.Forms;
 
-namespace Greenshot.Plugin.Drawing.Adorners
+namespace GreenshotPlugin.Interfaces.Drawing.Adorners
 {
 	public interface IAdorner
 	{

GreenshotPlugin/Interfaces/Drawing/Container.cs

@@ -18,17 +18,17 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 using System;
+using System.Collections.Generic;
+using System.ComponentModel;
 using System.Drawing;
 using System.Drawing.Drawing2D;
 using System.Drawing.Imaging;
 using System.Windows.Forms;
-using System.ComponentModel;
-using System.Collections.Generic;
-using GreenshotPlugin.Interfaces.Drawing;
-using Greenshot.Plugin.Drawing.Adorners;
+using GreenshotPlugin.Interfaces.Drawing.Adorners;
 
-namespace Greenshot.Plugin.Drawing
+namespace GreenshotPlugin.Interfaces.Drawing
 {
 	public enum RenderMode { EDIT, EXPORT };
 	public enum EditStatus { UNDRAWN, DRAWING, MOVING, RESIZING, IDLE };

GreenshotPlugin/Interfaces/Drawing/IMemento.cs

@@ -18,9 +18,10 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 using System;
 
-namespace Greenshot.Memento {
+namespace GreenshotPlugin.Interfaces.Drawing {
 	/// <summary>
 	/// Description of IMemento.
 	/// </summary>

GreenshotPlugin/Interfaces/Forms/ImageEditor.cs

@@ -22,7 +22,7 @@
 using System.Drawing;
 using System.Windows.Forms;
 
-namespace Greenshot.Plugin {
+namespace GreenshotPlugin.Interfaces.Forms {
 	/// <summary>
 	/// The IImageEditor is the Interface that the Greenshot ImageEditor has to implement
 	/// </summary>

GreenshotPlugin/Interfaces/Generic.cs

@@ -19,15 +19,14 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-using Greenshot.Memento;
-using Greenshot.Plugin.Drawing;
 using System;
 using System.Drawing;
 using System.IO;
 using System.Windows.Forms;
 using GreenshotPlugin.Effects;
+using GreenshotPlugin.Interfaces.Drawing;
 
-namespace Greenshot.Plugin
+namespace GreenshotPlugin.Interfaces
 {
 	/// <summary>
 	/// Alignment Enums for possitioning

GreenshotPlugin/Interfaces/IDestination.cs

@@ -18,12 +18,13 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 using System;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Windows.Forms;
 
-namespace Greenshot.Plugin {
+namespace GreenshotPlugin.Interfaces {
 	public class ExportInformation {
 		public ExportInformation(string destinationDesignation, string destinationDescription) {
 			DestinationDesignation = destinationDesignation;

GreenshotPlugin/Interfaces/IOcrProvider.cs

@@ -19,7 +19,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-using Greenshot.Plugin;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Threading.Tasks;

GreenshotPlugin/Interfaces/IProcessor.cs

@@ -18,9 +18,10 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 using System;
 
-namespace Greenshot.Plugin {
+namespace GreenshotPlugin.Interfaces {
 	/// <summary>
 	/// Description of IProcessor.
 	/// </summary>

GreenshotPlugin/Interfaces/Plugin/HotKeyHandler.cs

@@ -1,4 +1,4 @@
-namespace Greenshot.Plugin
+namespace GreenshotPlugin.Interfaces.Plugin
 {
     public delegate void HotKeyHandler();
 }

GreenshotPlugin/Interfaces/Plugin/IGreenshotHost.cs

@@ -1,6 +1,6 @@
 using System.Drawing;
 
-namespace Greenshot.Plugin
+namespace GreenshotPlugin.Interfaces.Plugin
 {
     /// <summary>
     /// This interface is the GreenshotPluginHost, that which "Hosts" the plugin.

GreenshotPlugin/Interfaces/Plugin/IGreenshotPlugin.cs

@@ -1,6 +1,6 @@
 using System;
 
-namespace Greenshot.Plugin
+namespace GreenshotPlugin.Interfaces.Plugin
 {
     /// <summary>
     /// This defines the plugin

GreenshotPlugin/Interfaces/Plugin/PluginAttribute.cs

@@ -21,7 +21,7 @@
 
 using System;
 
-namespace Greenshot.Plugin {
+namespace GreenshotPlugin.Interfaces.Plugin {
 	[Serializable]
 	[AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)]
 	public sealed class PluginAttribute : Attribute, IComparable {

GreenshotPlugin/Interfaces/Plugin/SurfaceOutputSettings.cs

@@ -1,9 +1,9 @@
 using System.Collections.Generic;
-using Greenshot.IniFile;
 using GreenshotPlugin.Core;
 using GreenshotPlugin.Effects;
+using GreenshotPlugin.IniFile;
 
-namespace Greenshot.Plugin
+namespace GreenshotPlugin.Interfaces.Plugin
 {
     public class SurfaceOutputSettings {
         private static readonly CoreConfiguration CoreConfig = IniConfig.GetIniSection<CoreConfiguration>();