title: XLL plugin's DDEConnect() fails when connecting to Excel?
body: <p>I have a problem with connecting to Excel, there's a plugin that reads from db and tries to fill excel sheet with data across DDE, and it seems to be failing sometimes on DDEConnect function with error number 16390 - DMLERR_INVALIDPARAMETER Invalid parameter to DDEML function call. </p>
  
  <p>What is more interesting it is failing more often when pressing F9 (recalculates all formula in worksheet) then running from macro which goes through all worksheets and recalculates the formulae.</p>
  
  <p>Anybody with experience of DDE with Excel?</p>
  
  <p>Regards,
  Mika</p>