I have a C# .NET program that uses COM Interop to use an ActiveX control 
(the control is hosted on the main form).  I have successfully used the 
debug version of this program on four different computers in my office 
(Win2K Server, Windows XP SP1 and Windows XP SP2).  I just got a new 
computer running Windows XP SP2.  The same ActiveX control is installed on 
all the computers, and I know it's registered.  On the new computer, I get 
the following error when I try to run the program:

3 System.Object ForwardCallToInvokeMember(System.String, 
System.Reflection.BindingFlags, System.Object, Int32[], 
System.Runtime.Remoting.Proxies.MessageData ByRef)   at 
System.RuntimeType.ForwardCallToInvokeMember(String memberName, BindingFlags 
flags, Object target, Int32[] aWrapperTypes, MessageData& msgData) at 
TWSLib._DTws.connect(String host, Int32 port, Int32 clientId) at 
AxTWSLib.AxTws.connect(String host, Int32 port, Int32 clientId) at 
IB_API_IInterface.MainClass.Connect(Form1 frm) in E:\(path to the 
program)\Form1.cs:line 535

I've googled this issue and found some entries, but nothing explains why 
this error occurs only on this new computer.  Would it help to compile a 
release version and deploy that instead of the debug version?  But it still 
doesn't answer why this happens on only one computer, which is configured 
exactly like the other WinXP machines.

Any ideas would be most appreciated.