calling COM object from thread

Question

Hi I've got a client app written in C#. I've got a function in my main form which calls a COM method in my COM server. If I call this function from a button on my main form, it works fine. If I call it from a separate thread in my client app it doesn't work (I don't get an exception, and debugging in the server end has shown me that the COM method never gets called at the server end).