Icon Import Error

I was trying to find D-Link icons and I wasn't able to find one quickly so I found a generic wifi router icon which was 98kb and when trying to add it as a selectable icon in RDM I received the below error:

ArgumentNullException - Value cannot be null.
Parameter name: encoder
at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
at System.Drawing.Image.Save(Stream stream, ImageFormat format)
at Devolutions.RemoteDesktopManager.Forms.FrmSelectCustomImage.GetImageBytes(Image bitmap)
at Devolutions.RemoteDesktopManager.Forms.FrmSelectCustomImage.AddImage(String fileName)
at Devolutions.RemoteDesktopManager.Forms.FrmSelectCustomImage.butSelectNewImageFromDisk_Click(Object sender, EventArgs e)
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.Label.WndProc(Message& m)
at System.Windows.Forms.LinkLabel.WndProc(Message& msg)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Please advise if external icons are not permited at this point.

I also noticed that the icons changed as well while the session is open when moved to a different location. I created two new sessions (Embedded) and while they were both open I created a group and moved them both into the new group via drag and drop. The icons changed when the move completed. So I moved them back to their orginal location and the icons changed to "open session or play" icon.
edited by fvigo1128 on 12/16/2012
edited by fvigo1128 on 12/16/2012