Master/Child Link breaks when opening in Access 2007

Anyone have any idea why that the Master/Child link between a Form and
Subform generates a 'Parameter' error in Access 2007 and works just fine in
Access 2003. I have a form which has been used for years with no problem.
It is a Master form which has a sub-form which in turn has 2 other subforms.
The parameter error indicates that the link between the first sub-form and
the 2 other sub-forms is not found. It is a multiple field link but the data
types match as expected. I have temporarily changed the recordsources of the
sub-forms to do the filtering but this seems like a 'hack' and would be
extremely time consuming to do in the entire program.

Any help would be appreciated as I am concerned where else this problem will
arise with other customers using Access 2007.