We seem to have got things to work by changing the way the COM DLL is written - 
though don't really understand why.
Basically we have changed from using PostMessage() to to marshaling the COM 
interface in order to fire events.
We cribbed off of the following -  
"http://www.codeproject.com/KB/COM/python-comtypes-interop.aspx";

Regards,

Calum....



      
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