change caption from report header Format event (runtime error)

[cbo]

Hello,

i'm trying to change a label's caption when receiving the "report header
format" event

the code only puts the value of a global variable (a collection) into
the caption (sorry, translated from french!) :

Private Sub ReportHeader_Format(Cancel As Integer, FormatCount As Integer)
Me.MyLabel.Caption = MyVbModule.MyPublicVariable.Item("STARTDATE")
End Sub

This works fine on my PC, but on some other PCs, the following error
appears : "runtime error -2147352567 (8002009) : not enought memory to
run this operation, close some applications and try again"

any help greatly appreciated !
Chris