Client crashes when calling method in server

Hi,
Still working away on my remoting based client/server setup - new problem I have is as follows:

My windows service (the "server" as far as remoting is concerned) has a method that is called by a timer at certain intervals. This raises events that the "client" (a Winforms app) receives and acts on. This works absolutely fine. However, I want users to be able to manually kick off said method whenever they want in addition to the timed ones, and this is where the problem lies. I put a button on my forms app that calls the same method in the server, but at the point within the method that the event is fired back to the client, the client freezes. I assume this is because the method it called on the server hasn't yet completed, so the two bits of communication are somehow getting crossed and cocking things up... any pointers?

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