Unfathomable Assembly not Found error

Hi, I'm having problems deploying a very simple application to a server with the .NET framework but not the VS .Net IDE installed. I've tried deploying to other servers with and without the IDE; it always works on the former and never on the latter. I've included the error text at the bottom, but essentially it's an Assembly not found error. The file itself, "xxdotnetclient", is a 3rd party dll, in the same directory as the calling application, and it has no dependencies. The versions of the Framework are the same on all of the machines, and the settings in the .NET configuration wizard are identical. I'm logging onto all of the machines (using Terminal Services across a network), and have admin permissions on all of them. I've tried everything I can think of, and done a pretty exhaustive (literally!) search of the net for help, but without success. So, any ideas why this mught be happening, and how the presence of the IDE on a machine could allow the application to work when it doesn't with just the Framework installed? Any help would be greatly appreciated! Cheers, Dave ************** Exception Text ************** System.IO.FileNotFoundException: File or assembly name xxdotnetclient, or one of its dependencies, was not found. File name: "xxdotnetclient" at WSAppTest.Form1.button1_Click(Object sender, EventArgs e) at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) === Pre-bind state information === LOG: DisplayName = xxdotnetclient, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null (Fully-specified) LOG: Appbase = D:\WUTemp\WSAppTest\ LOG: Initial PrivatePath = NULL Calling assembly : WSAppTest, Version=1.0.1850.20221, Culture=neutral, PublicKeyToken=null. === LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Post-policy reference: xxdotnetclient, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null LOG: Attempting download of new URL file:///D:/WUTemp/WSAppTest/xxdotnetclient.DLL. ************** Loaded Assemblies ************** mscorlib Assembly Version: 1.0.5000.0 Win32 Version: 1.1.4322.573 CodeBase: file:///c:/winnt/microsoft.net/framework/v1.1.4322/mscorlib.dll ---------------------------------------- WSAppTest Assembly Version: 1.0.1850.20221 Win32 Version: 1.0.1850.20221 CodeBase: file:///D:/WUTemp/WSAppTest/WSAppTest.exe ---------------------------------------- System.Windows.Forms Assembly Version: 1.0.5000.0 Win32 Version: 1.1.4322.573 CodeBase: file:///c:/winnt/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c561934e089/system.windows.forms.dll ---------------------------------------- System Assembly Version: 1.0.5000.0 Win32 Version: 1.1.4322.573 CodeBase: file:///c:/winnt/assembly/gac/system/1.0.5000.0__b77a5c561934e089/system.dll ---------------------------------------- System.Drawing Assembly Version: 1.0.5000.0 Win32 Version: 1.1.4322.573 CodeBase: file:///c:/winnt/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f11d50a3a/system.drawing.dll ----------------------------------------