[AccessD] Text Box Control Source Problem

I am doing a small job on Access 2K and having strange happenings!
   
  I have a series of Text Boxes in the Form Footer which should add up minutes spent by employees on different tasks. However they are all showing #Error
   
  If I enter into the Control Source of one Text Box:    
   
  =Sum([qryIG_Wed].[DBAdminEventTime])
   
  and try to save it, it changes to 
   
  =Sum(qryIG_Wed.DBAdminEventTime)
   
  If I enter 
   
  =Sum(qryIG_Wed.DBAdminEventTime)
   
  and press Enter, it changes to
   
  =Sum([qryIG_Wed].[DBAdminEventTime])
   
  If I View the Form I have #Error, however if I have the Properties Box open in View Mode and enter
   
  =Sum(qryIG_Wed.DBAdminEventTime)
   
  it converts it to
   
  =Sum([qryIG_Wed].[DBAdminEventTime])
   
  and the correct figure is shown in the Text Box.
   
  I have spent 4 hours on this problem and it is driving me crazy!  I have tried importing everything into a new database. Compacted and repaired. In fact everything I can think of short of using a hammer on the computer. (within the next hour).
  I am sure I am missing something very easy.
   
  Someone help me please
   
  Chris

 
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